AD&D 2e is sort of the "forgotten" edition of D&D. By the 1990s gamers were moving on to other things.
There are people out there passionate about AD&D 2e, but they're more keen on bringing back a campaign setting, like Ravenloft or Planescape, rather than seeing an AD&D 2e resurgance.
You can see this among communities on G+: plenty of OSR communties, stuff for 4e, but those that touch upon AD&D 2e are usually based on a campaign setting. Heck, even in an edition war you hardly ever hear anybody passionately defend AD&D 2e.
I'm convinced part of this is the marketing that WotC did just when they were promoting 3e back in the day. They wanted to distance themselves as much as possible from the mistakes that TSR made. If you look at issues of Dragon Magazine at the time, you'll read over and over again how Thac0 is counter-intuitive. While Thac0 has been around since 1e, 2e used it exclusively.
Try mentioning to somebody, "hey, I'd like to run a 2e campaign." Chances are, if they know anything about the game, they'll say something like: "But that uses Thac0. Thac0 is confusing!"
End of discussion.
AD&D and OD&D (and Retroclones) have the nostalgia working for them. 3e/3.5e still have support from diehard fans, as does Pathfinder. Even 4e has its adherants.
I'd like to see a resurgence of AD&D 2e, but it'd have overcome 13 years of marketing inertia and opinions.