While some people do multibox, there isn't that much where it's truly necessary. And the "dead" servers have a tighter community that helps each other out more which largely makes up for a smaller player pool
There's also minimal RMT or spam /yells.
Doesn't mean we wouldn't mind more players, of course. But there's two main reasons why most ppl who haven't already moved aren't keen on moving:
-They still have friends on their server that they've had for a long time
-They feel that they shouldn't have to pay for a server transfer to address something that SE should have addressed with a merge years ago when it would have made more sense. As noted in my previous post, I think it's too late for a merge to really change anything. The community has dogpiled Asura to the point of overpopulation and it would take removing some players from asura to have balanced server populations even with a merge.