Couldn't a lot of those services just move to Tor and / or small financial haven countries?
The online wallet guys, sure.
But overseas or "anonymous" exchanges have the problem of getting your money into them, and miners who try to mine over Tor
will eat big stale rates, especially as blocks begin to grow.
Of course, this is all assuming "the government" (human lawmakers and bureaucrats with complicated incentives) cares enough to take punitive action at all.