It's still too draconian, IMHO. Detection of the problem that might allow a malicious sensor is good. You provide a pop-up that the fingerprint scanner is insecure and needs to be repaired by Apple (and you train Apple employees to not tell people their phone is bricked), disable Apple Pay and require the user to select another unlock method (including none-- I don't use a lockscreen on my phone). Or require a pin when the sensor is first set up that is required when the error is detected (not ideal, folks might not have the pin handy, but better than total shutdown). That's it. It's up to the user what to do about it, but it is *never* okay to lock a user out of their data and functionality. It's especially bad that this is an after-the-fact change imposed by a new version of the OS made, AFAICT, without much warning or user education. Just another opinion, of course. One of the reasons I root and use ROMs is the arrogance of all device makers and Google (not just Apple) that they know what's best for me.