I don't see as a divide. We are all supporters of a decentralized technology. And in here on bitcointalk we are meeting at a centralized place. Why not have a few more forums? At least one more can be a good alternative to this one. In other fields out of crypto currencies I'm also registered and participate in more than just 1 forum. For me in personal there's nothing wrong about that.
But I believe the forum at bitcoin.com will have to show if it can grow and therefore stay sustainable.Not easy and can take quite some time. This forum here will still be the major one imo.