Teeb's handy flowchart:

Was it in 1.12?

Yes --> it should be in Classic.
No --> it should not be in Classic.

That's all I have to say really - in my opinion, no.

Interesting that you say Kara was intended for Vanilla and not BC though - where does it say this?

What the hell...whats this idea?!

*WARNING* Unpopular opinion *WARNING*

I would not be opposed to it, after a very long time of Naxx (maybe 6 months?) I would love to see additional content added to classic. Call me crazy but I don't want TBC, I would like to have the OSRS approach and continue on classic vanilla wow. I realize this is unlikely given how many people cherish TBC. This is just my opinion.

Interesting that you say Kara was intended for Vanilla and not BC though - where does it say this?

You can read about it in the WoW Diary by John Staats. There was a bunch of other content intended for Classic that they could not fit in but Kara was actually one of the first raids they worked on.

Oh, I forgot to mention...

Ateish, which is obtainable from Naxx, teleports you to Kara. This only makes sense if Kara is supposed to be a place where you'd actually want to go because it has things for you to do.

I'm okay with Kara being added waaaaaaaaaaay down the line as new content. But the game itself needs to have multiple guilds farming Naxx until their eyes bleed.

I can understand the interest in this, but I didn't get to play a whole lot of Vanilla when it was current. I really want to experience it as close as possible to the original as they can make it. After Classic, if they want to spin it off in an entirely different direction I think I'd be cool with that.

I'm fine with them adding some extra content, but Naxx should always be where the top-end gear is found. Adding onto the vertical progression would eventually kill the game for new players imo. I don't really like the idea of catch-up raids either because that invalidates the older content for new players, which is one of my major problems with post-vanilla WoW.

The whole point of vanilla is that its more hc. Dumbing down and adding catchup, we might aswell add whole bfa expansion to Classic and call it Classic.

I love Karazhan and would love to see it in Classic. The soundtrack <3

If there ever is a Classic+ Kara would be at the top on my list of things that should be added.

I'm surprised to see so much support for "maybe".

I chose the 'No, but it's fun to think about option' mainly because I don't want any major changes like this in the game. Maybe a few years down the road I'll be a bit more receptive to the idea.

Right now though, please just transport me back to 2005-2006 as if nothing happened after it. Thank you.

I think it's important to discuss stuff like this if we ever want Classic to be more than a temporary foray into nostalgia land. Do we really want Classic to be a 2-3 year flash in the pan, and then we all go back to complaining about retail? Yes, I want it to start and end as close to Vanilla as possible. But I also wouldn't be adverse to them expanding on that and giving us additional content that is more in line with what we wanted to begin with, rather than the watered down experience many of us feel we received. Maybe instead of thinking about a relaunched BC server, the writers, creative team, and whatever scrappy group of developers they have working on this thing could say "Ok, we already covered the story in one way when we made BC the first time. This time, what if we did it like this?" The same characters could have different stories and conclusions. Maybe Cairne would roflstomp Garrosh this time(as he would have if it weren't for Magratha)? Maybe Thrall stops trying to be shaman orc jesus and never abdicates the position of Warchief to begin with? What if there's a schism in the factions and we end up with 3 sides to the conflict? There were a lot of ways things could have gone differently, and at a certain point I'd be ok with exploring some of them.

Some of this is wishful thinking, and some of it is hoping Classic isn't just a one-off.

I think it's important to discuss stuff like this if we ever want Classic to be more than a temporary foray into nostalgia land. Do we really want Classic to be a 2-3 year flash in the pan, and then we all go back to complaining about retail? Yes, I want it to start and end as close to Vanilla as possible. But I also wouldn't be adverse to them expanding on that and giving us additional content that is more in line with what we wanted to begin with, rather than the watered down experience many of us feel we received. Maybe instead of thinking about a relaunched BC server, the writers, creative team, and whatever scrappy group of developers they have working on this thing could say "Ok, we already covered the story in one way when we made BC the first time. This time, what if we did it like this?" The same characters could have different stories and conclusions. Maybe Cairne would roflstomp Garrosh this time(as he would have if it weren't for Magratha)? Maybe Thrall stops trying to be shaman orc jesus and never abdicates the position of Warchief to begin with? What if theirs a schism in the factions and we end up with 3 sides to the conflict? There were a lot of ways things could have gone differently, and at a certain point I'd be ok with exploring some of them.

Some of this is wishful thinking, and some of it is hoping Classic isn't just a one-off.

I think that Old School Runescape is the best example of how to keep the old school feeling in the gameplay while still having fresh content patches released all the time. Before the Old School Runescape team started releasing these patches and just let the game run on it's on, you could see a clear downwards trend in the peak daily player population, The game started of with 70k+ peak but it hit as low as 10k-ish players peak per day after a year or two. Currently they are sitting on 100k+, which goes to show that there is a need for new content at some point down the line.

I don't see a point of this but I am aware of size and numbers of conent available in Classic. This is one of my biggest problems, that there will be a point in life cycle of Classic that there wont be anything NEW to do.

I get that the fact that Blizzard wanted it in vanilla and I understand the desire based on that, but warlocks were also intended to have sufficient melee ability and that didn't pan out either. If they patched vanilla to give warlocks a melee spec that would be fucking awful.

So unfortunately I'm a no on this one.

Kara is my favourite raid. If it was added it would need to have minimal impact on progression, slotted in somewhere at the start, but what's the point.

Id happily wait for legit TBC for it eventually rather than break the cycle of classic.

If there was ever a raid that wasn't in Vanilla that should have been it would be Karazhan. The entire instance is a microcosm of Vanilla dungeons and raids in terms of variety. All of the different landscapes and boss types (and fights) were incredibly delightful and I wouldn't complain if it were added to Classic. Beside the fact that it is located in an area that is within Vanilla territory it doesn't feel out of place regardless of the time it was put in game to be playable.