It will not happen soon but there is of course a chance that it will be possible because you also see that Bitcoin is getting more used and more acceptable so that is nice
I think that's not a criteria on why bitcoin would replace dollar.
Governments don't want something that is uncontrollable. It's either they kill it or acquire it. Same as in bitcoin, It will only replace dollar if it is under the control of the government, probably a centralized one.