You're right! Only it is not clear when this will happen ... maybe in a year, or maybe in 100 years. But the fact that cryptocurrency will replace the current money is a fact.
The banking sector is very actively trying to oppose the ideas of liberalitarianism that underlie the idea of cryptocurrency. It seems to me that further scenario development is waiting for us: either the bankers will strangle the crypto industry or take it under control.
It is not at all profitable for them to kill a cryptocurrency, it is always better to do a common thing with them, because there are a lot of people who use this platform.