The poor are already leaving the banks
http://www.theatlanticcities.com/jobs-and-economy/2013/09/why-poor-choose-go-without-bank-accounts/6783/

That they will use Bitcoin is open to debate but the traditional banks are not serving their interests sufficiently.

In the end no one really knows whats going on, but betting on some kind of continuation of the current fiat model seems risky.