Ehm. Isn't the main purpose of these coins to be traded back and forth anonymously? I would say it's much better to have centralized exchanges not mess around with them. It obviously hurts the liquidity, but in return you get a greater deal of privacy. Anyone buying such coins from a centralized exchange to finance or buy something the state doesn't want is a dumbo.
Also, the actual use of these coins is highly overrated when it comes to their privacy features. Not enough people care enough about what features they offer to actually be upset about exchanges removing them slowly but surely. I expected the use of these coins to pick up, but adoption wise they haven't gotten anywhere.
That might be true only because most of the people who are participating in the cryptospace are only using cryptocoins as speculative investments. That might not be true anymore in the future when everyone begins using them as currency.