If they pay a decent rate of interest, then why not?
Centralization? Sure. Regulation? 100% bummer.
But on the flip side, what would a bank do with Bitcoin deposits? Lend them to people that don't have them? That would be my guess. So, let them drive adoption.
Wouldn't touch them myself; well not unless I had to get a really big loan to buy a beach hut on the other side of the planet.
I think if bank lends the deposits to other people, it will be nice. Right now, there are many scam methods. One of them is borrow bitcoin without any valid collaterals and they never return it. Maybe bitcoin banks can solve this problem because banks have good collateral standart in credit application.