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.
Yup, most of the Government will not set a bitcoin as official currency (most likely). because we can know well, bitcoin is a digital currency that the server can not dimonitoring properly or effectively. And also any transaction bitcoin are anonymous, though transparent bitcoin has not shown evidence of who is doing the transaction. The main thing being the bitcoin security in Government options