A lot of people on Facebook, in specialized groups (otherwise I would have linked them), are discussing moving to other forums or Reddit itself, then using a free file hosting platform.

Some are people that are looked at highly by the community and will probably leave a hole in AA's forums if they leave. These are developers, people that helped with trouble shooting, etc, as well as just supportive members.

It is going to be interesting to see how AA moves forward. I agree with you though, I cannot see Atari allowing infringing content to remain on the site. Some was even sold in the AtariAge store with several unique pieces already taken down at the request of the AA member that created it (just want to be clear, no word from Atari has been made public on this).