citrus, I feel like its time you cut your losses, and instead of focusing on what Fanimecon was, you should focus on what it is, and whether other cons will better suit your needs. (I think they will.)
Fanime tends to be going more in the direction of "hangout and party con," which is cool if that's what you're into, but that's obviously not what you in particular are into. I still go because it is local and relatively inexpensive (it's the only larger con I can afford to go to), and it has a great cosplay scene. since I'm primarily a cosplayer, it suits my needs just fine, despite some of its other issues (which have been improving in some ways, but not in all). If you go primarily for guests, though, Fanimecon does not typically deliver on this front, and you should go to another con. If you are able to still go to Fanime and not spend a lot of money on hotels and travel and such and just enjoy it for what it is, great, but if not, save your money and take it elsewhere.
It may be hard, especially if it was your first con (Fanime was my first con...in 2003, haha), since you have that nostalgia factor, but really, it's clearly not the con for you.
(I also wouldn't say that "most attendees have stopped attending," since the attendance numbers don't really back that up, though I'm sure there are quite a few ghosters who come just for cosplay and room parties, and I'm sure there are people who left after the few disastrous years the con has had, but there's hasn't been a huge drop in attendance, as far as I know.)
Is there room for improvement at this con? Certainly. But your tactics aren't really the way to go about it.