In my personal opinion, for as long as World of Warcraft has over 1 million subscribers, it is a very successful game with a large player base because 1 million subscribers is a huge amount of people.
Also from what I can tell, a lot of things are going to change in Legion, which I think will be cool, I just hope its all great.
One thing I wish Blizzard had were expansion dedicated servers which I think could be good. I would start a character on a vanilla server, grind fest my way to level 60 just to see how hard it actually was, then transfer my character to a BC server than Wrath server just to experience all that great endgame content some of the expansions had.
Its almost impossible to experience ICC or Black Temple the proper and hard way anymore which is one thing I don't like about wow. You can't go back and do proper raids that you once did. I like the Timewalking dungeons but I miss ICC.
I wasn't going to write all that but I just got into it.
Heheh, people have been asking for that for quite some time! And I personally agree. I played on Nostalrius (Vanilla) a bit and am currently playing occasionally on warmane (WotLK), and those servers are lovely. Fantastic communities, and the experience is pretty authentic aside from the fact that knowledge is publically available/minor bugs/people aren't as noobish as they were when the game was first around.
They've actually been getting a lot of recent attention now that the private servers are of much higher quality (both the servers I mentioned are practically full around peak time [~8k players, which is pretty insane]), and 'blizzlike' and content progression is getting more popular (for example, warmane started off with a lvl 60 cap, and is currently at lvl 70 cap, and in a little bit it'll have an 80 cap and unlock raids/PvP seasons one-by-one).
Now comes the big question: if there is so much hype, why doesn't Blizzard do it? A lot of people would
pay for it. There really isn't a risk to it as far as profit goes--but I think the big reason is that it divides your community. Blizzard's mentality is that you
should be playing their latest xpac. That is what people come back for, it is continually updated, and they'd rather not divide players further (e.g. if one's friends moved to a particular xpac server, they would feel inclined to play on that server). The newer xpacs are far more maintainable, etc.
Lore (Blizzard's community manager) talked about it
briefly. He mentioned that it was a risk-reward thing--was it worth it to devote so many people to updating/maintaining a legacy server vs. having them work on current problems?
Personally, I don't think publicity is an issue. People say that legacy private servers are only popular because their free, but I don't think that is the case. I would pay my sub for an official legacy server. Other people have said the same. I think the biggest problem is that it would take away from the current servers. If it was announced, people would
flock to the server. We'd see resubs everywhere, at least for a while, and it would definitely hit 'full' on all the servers they support for it. However, the question is: how long will it last? What will happen to the side servers?
For the longevity thing--it probably would last a few years. If they do it progression-based, then they could definitely stretch it out. However, after that it would probably settle down once enough people have experienced their fill of the content. Personally, I played Nostalrius until about lvl 51 and lvl ~30 on an alt. I might return eventually but for now I'm on hiatus.
During retail (current) troughs in activity (e.g. right now, where basically everyone is waiting/preparing for Legion), those servers would probably see a lot of activity. When retail gets a new patch/new content, the current servers would get big boosts in activity. In a sense, one potential problem could be from legacy servers 'stealing' people away from retail servers, and this would probably cause unrest (no one wants to play on a dead server).
My personal thoughts: I would play it if they did it. 100%, no doubt about it. I can see why they wouldn't do it though. It is definitely risky--not necessarily profit-wise, but companies generally try to avoid competition within their own company. That is why they have quarterly based releases that are usually separated from one another. I would love to see it, but I doubt it will happen. For now, I'll stick to these private servers until Legion launches.
P.S. Sorry for the wall of text & the discussion of private servers. But it is an interesting topic, and I couldn't help but give a substantial reply. :3