Here's an idea: banks will maybe catch on to the cryptocurrency trend, but would charge a fee for transactions & stuff.

Meaning, transfers within blockchain are not very expensive generally, but they would charge their percent on top.

I think that might be entirely possible, as there's a lot of folk who are too intidimated by the technology & can't get the hang of it.

The people to use it would be those who just can't figure the way to send payments themselves (e.g older people & like).