Nope. I very doubt government will want to relinquish control...
As a sub currency it could gain mainstream use but i think there will be much blood before BTC replace the Dollar.
I agree. I doubt that it would replace the dollar. It plays in a different market altogether, and I think, even if the value of bitcoin would continue to rise, there will still be some people who would trust using fiat than crypto, and there, the dollar would come as a surety to keep the market going. I foresee bitcoin and dollar would interplay and maybe used side by side instead of one replacing the other.