The reason I am afraid Gaia will turn into "neopets" is not because ANY of the reasons you stated.
I realize that it is not the same *type* of site, but many of the SAME people FROM Neopets are coming here. It reflects on the experience, and then many start demanding new updates to be very similar to Neopets-related things, too.
Yes, it is a forum based site still NOW, but what about in two years, if millions of Neopet users invade here? And Gaia is actually a site where the admins LISTEN to the users. So, it could definitely change focus to games, or pets, etc. If the maturity level changes, and parents begin to whine that it's too provocative and take the admins to court, it could ALL change. We can't ever expect anything to stay the same, why think it will?
There's always a possibility for everything.