Possibly happen if the government joined to Bitcoin, also if they seems that Bitcoin will earn a lot, they can use them power to manipulate the Bitcoin live in the market. Because if the price in the market were high, government will gained them.
The government will never gain power over bitcoin. This is a system that can not be controlled by any side. Bitcoin is free and decentralized. Nobody can manipulate the price
It is a matter of suicide if the government joins and adopts bitcoin. Because of course it will kill their local currency And make local currency unused. The government will not do that.
and bitcoin is decentralized, government can't control it moreover manipulation price