I'm not sure that bitcoin will replace Dollar Soon. the government will verify, analyze & discuss hardly with the parlement before take an important decision. cause it effects to the economy, politic of the country.
Yup. There are factors that run the current fiat market that would greatly be affected if btc takes over. I don't think banks and governments would allow that to happen unless they have full control over btc, which is unlikely to happen.
But they can make so move to take over with bitcoins ,remember governments will always find their ways to make money even bitcoins is not in their hands like in my country the taxes will be increase but because it is for the own good of our country by using that taxes to improve infrastractures and so on.