Well said, SeattleMoose, about a maturing market, and the anarchy of seeking "change for the sake of change".
And to those who think that fingerprint or other biometrics are a fad, like I8P'CS, it is actually a method for better security, and wider acceptance of digital transactions with biometric acceptance of trust.
A device now is just a device, and can be programmed with fraudulent or stolen data, or the device itself could be stolen, and operated by someone other than the owner of the information being used. (like a stolen credit card... but that requires a PIN, or recorded signature to verify, an open device without a passcode doesn't even require that... and is difficult to truly trust, in terms of financial and other identity-sensitive transactions.)
A time and GPS coded fingerprint or retina scan verification is an increased measure of trust that the USER is who they say they are, and the device is just the medium of transaction and verification.
Theoretically, the user's device could 'salt' the security identifier code with as much metadata as one wants... The exact time of the transaction, GPS location, IMEI/ESN/MAC address record, a shared encryption key, network communication session identification number, the device's plain name, maybe even a quick image capture from the user-facing camera or a specific facial/retina recognition image, and a logged fingerprint scan.
That isn't even counting a docked add-on for other functions.
that is all current functionality, plus a consideration for a rumored fingerprint scanner as a biometric tag of the user, not just information about the device and transaction.
That will open device-to-device transaction trust much wider. NFC might actually help that also, as proximity, plus security verification can further enhance trust, not just anyone on a WiFi or Cell network. Near-Field Comms are defined by proximity within inches.
Security as well as differential identification possibly could open the door to multi-user interfaces, and multiple user profiles on the same device.
If my spouse and I share an iOS device, simply by touching the fingerprint sensor, the interface and/or preferences could shift to my favorites and preferences, and back to hers when she touches the device.
Cloud-based roaming profiles might not be too far behind that... even for public kiosk use. Workplaces with tablets or phones can have a pool of devices, you pick one up, and it is configured by your server or cloud stored profile and data store. It doesn't matter which one you happen to have picked up. A simplified digital checkout lane, or an interactive restaurant menu that accepts payment directly on the device, and remembers your "usual", and suggests similar dishes...
Any number of versatile uses of a biometric identification factor on a public, or privately owned device.
One often can't see the gestalt shift before it happens, or predict a big new technological revolution... but even with the tech we have, there are new streamlined functions to be explored, and increased security and trust are integral in taking the next steps.