I won't continue on this direction since we are on the same page (with tiny bit different levels of "optimism") and I don't want to go too much off topic.
Haha, that's a very diplomatic way of saying that I'm a cynical old fart. 
I can hope that mixers and privacy coins will not be harmed too soon.
At least the mixers can easily survive by handing over logs if asked with a warrant.
I would hope that as and when it comes to that, the good mixers will be able to go the way of the good VPN providers, and prove to a court that they have no logs which they can hand over. Certainly any one which can do that is likely to see an increase in activity and volume. That's if blinded nearer certificates or some other untraceable mixing method doesn't become commonplace first.At least the mixers can easily survive by handing over logs if asked with a warrant.