i think government could kill and stop bitcoin if they want and they can do it as fast as they can because they have unlimited source to do this. but i think the government will thinking to not stop or kill bitcoin and i think they are now is study about bitcoin, they have many questions about bitcoin and they need the answer. so they let us to still use bitcoin because they know that they can learn bitcoin from many ways and they want to see how bitcoin in future.
There is a big possibilities that they can stop the process of bitcoin, because they have the power and the technology to track the btc. I think they're still studying of what will btc bring to the economy and if they think they can get benefit to it they will keep studying on how btc work. The investments which I think is helping the government and the bank through the process knowing it more.