However unlikely and practically impossible that scenario is I will answer anyway - Nothing would happen that doesn't now just a move from centralized to decentralized. Not sure what would happen to the forum especially the trading and exchange! Guess it would be closed.

* We may lose a few community members a long the way but it would not be a big deal because we probaby would have lost them anyway. The rest would get smarter.

* The solution would be to continue as is but taking better precautions than we already do. Bitcoiners are not stupid (well the majority aren't) Also there are decentralized exchanges with smart contracts in the alt world that can be used for btc as the main exchange.

Saying that imo there will be no ban on bitcoin as they will see it is near impossible to enforce with decentralized exchanges popping up for trading coins and goods. In my mind they could only regulate and ban centralized exchanges and services.