What do you think?
People will choose bitcoin but more cryptocurrencies included, the world is complicated, what makes the world more complicated are humans, like see the case of El Salvador, some people supported bitcoin while some people did not, that is just humans for you. Some people will support fiat even as fiat are decreasing in value all the time while the government are manipulating the price towards price devaluation and some people are just ignorant and like the old things. What you are saying about bitcoin is right, more people will accept it, but there are many currencies that will be also existing in the future, centralized currencies will also be among because people like what is from the government, even when it has some disadvantages.
Those people who are not aware about the importance of bitcoin or living in the delusional world created by Government where btc is used for scam and is bubble don't trust it and have full trust over the legal fiat as it is prevailing from a long time even if it's value is diminishing over these years.You can't put the whole world in one place to live jointly and have same mentality and this is what's happening as you said that many believe in bitcoin some in other coins and some already relying on fiat and traditional financial market.But you first need to backup your future and you should find the best way for that.