That they will use Bitcoin is open to debate but the traditional banks are not serving their interests sufficiently.
In the end on one really knows whats going on, but betting on some kind of continuation of the current fiat model seems risky.
I don't doubt poor are leaving banks. But a lot of what is going on these days is that there is no interest financing 24/7 on everything it seems with no payments for years. I know so many people who do this, and pay it off before they owe interest.