From what I can remember the reason for many people leaving the forums was because of the political discourse that plagued many threads around mostly from around 2019-2020. There was a lot of toxicity around the forums and the mods had to step in and hand out bans for some people. There was a big conflict between forum user and mods and many people ended up leaving. I think it has less to do with console wars and more to do with how bad the political climate was at the time.