Well their can not be uncapped fractional lending as it is right now. The bank could offer a credit card equivalent, but it would need an equal amount of deposits. The current system works by essentially crediting the merchant an IOU, whose value does not have to be real. With crypto merchants get to choose, would they rather have native crypto, or an IOU with strings and contracts attached? Obviously the latter is more risky, and therefor the seller has to factor it into the price/ transaction fee.

Maybe that can be somehow circumvented too. But it certainly is more difficult then the meddling that happens right now.