Absolutely! I'm always amazed at what people have been able to achieve with WoW emulation, it feels like a miracle to me.
Even if Blizzard decided to sunset WoW, we could still play all first 3 versions of the game, people can even setup servers on their own PC and play them like they were single-player games, there are even mods that add bots or tune instances to make them soloable.
More recent versions are much more difficult to emulate unfortunately so none of them has the same level of playability of vanilla/tbc/wotlk and probably never will.
Then there are much less "lucky" games, in that the interest about them is so much smaller than WoW that there's not enough manpower to reverse engineer them, it's sad.
If we could have at least the server specifications, it would help community so much in preserving all MMOs.