It is too late for that. They can't actually stop it and even if they did really lock down the exchanges people would gravitate to BitShares. If you aren't familiar with it you can just pop open the decentralized exchange in your browser www.BitShares.org and see the trades going on. No centralized exchange! That way there is nothing they can shut down. But it is too late for them to really shut much of anything down. I think there will be additional pressure on the exchanges to hand over information of those who converted from Crytpo to US Dollars....etc.