As long as they keeps their hands of on the actual crypto currencies then i dont think it's a problem. If we want adoption we have to be prepared for some sacrifices. And if we want to use it cryptos like fiat then we have to expect it's going to be regulated like one. Banks are front lines against money laundering and they are tasked to flag suspicious transactions. But as we make them irrelevant someone has to take on the mantle and in this case they are the exchanges.