If for anything, it might be transformed into a general Avatar TLA/LOK subforum and taken off of hot topics. It won't disappear. Just won't be a hot topic.
I REALLY WISH THEY'D PUT SOME HOT TOPICS AWAY ANYWAY.
It's to be expected, since new episodes will not be coming out for a good long time. It will probably leave Hot Topics, but it won't be gone. Although hopefully it'll just be accessible from the TV shows forum and not the Anime forum - I'm tired of the butthurt Naruto fans coming in screaming about it not being anime.