We should not be surprised that very soon the government would start controlling every aspects of cryptocurrency.
The government may succeed in controlling other cryptocurrencies but as for bitcoin it won't be possible for them, the government before now have tried to short down bitcoin or to control it but didn't work out for them. The government will not have any option to accept Bitcoin when they understand bitcoin is beyond control for anyone to to destroy it. Some countries that used to be big enemy of bitcoin are accepting bitcoin, this is what happens when they can't control bitcoin.
Governments don't need to control the assets themselves, they will (and often do already) control all the points of entry and exit.
Personally I think cryptos (and all digital assets) are going to be regulated just like stock shares if they aren't already. That won't effect your ability to buy or sell it, or transact with it. It will, however, effect your ability to conduct crime with it, or to evade taxes with it. The US clamped down on physical cash starting in the 1970s, and they will do the same thing for digital stuff.