I don't think so, maybe the the goverment won't agree that bitcoin will replace dollar because first of all bitcoin was not created by the government. We can't say when bitcoin can consider a real money because we can only earn it in the internet. Maybe one day bitcoin can replace dollar someday.
You are right, bitcoin never replace fiat for sure because there is no one thst can control it even though government, since its technology is surpass the current we are using it, as long as government can't control the bitcoin they won't rven take bitcoin to replace dollar. And when bitcoin is applied to our daily usage, the most riches people will soon change to a new one
