It's probable and possible, obviously governments will want to control cryptoassets. But this point has been discussed before.

The trade of "illegal" assets goes on and will continue to go on to the end of time, whether that's marijuana or prostitution services. The spectrum of legality will vary in different parts of the world. Like many contrabands, there won't be enough resources to enforce prohibition of it, the population may not see the point of its illegality (as there is not an obvious social cost), and eventually the tides turn.