Bitcoin will more then likely won't destroy fiat , Banks and goverments will simply won't let us do that . They will even make their own crypto currencies but It won't be decentralized like Bitcoin because they like to control .
Now if we speak about the price , yes It's going to rise a lot and if we speak about the users then yes It will rise a lot too but "Almost everyone" ? probably not .
Kinda agreed with this guy opinion about the topic discussion. Like what he said, right now Uruguay made move about creating digital currencies that is "not bitcoin". Bank and government absolutely won't let digital currencies destroy them. and the term used by everyone. I think we need to eradicate the lack of technology knowledge in some area in this world.

But that is not bitcoin purpose, bitcoin does not have as a goal to destroy fiat, the goal of bitcoin is to give you an alternative, there was no money to be had in this world that was not printed by a government and now we have hundreds of crypto that are precisely that and no only that we took off the middle man as well since you do not need banks, that is a great thing and something to not take too lightly.