It's impossible to kill bitcoin, without killing planet earth.
Its easy to kill bitcoin, if every country ban bitcoin and you would see price crash to 1$. Then all asic would have to shut down since its paying more electricity..
So what, USD and EUR will collapse, people will store value in BTC anyway, and when the collapse happens, BTC will sky rocket and you'll be butthurt because you got scared away by muh goverment.