I do not think that cryptocurrency can dominate over the entire financial system, but I am sure that it will become one of the most popular instruments in the world and this is already happening
In my opinion what you say doesn't make sense, real finance that brings a lot of money still ignores cryptocurrencies,for now, cryptocurrencies are just a drop in an ocean of money that goes around in important finance, then in the future we will see what it brings, for now it is still very early!