Apps won't be updated instantaneously on devices, though. There'll have to be some backwards compatibility for a good while if the banks want to change their APIs drastically. You can't just shut down access to your customers apps.
> You can't just shut down access to your customers apps
Yes you can, and banks already do this. Even the E-Trade app refuses to work unless it's on the most current version. When you control the apps and the API, you can pretty much do as you please.
