The more I hear this, the more upset I get. I don't use Apple Pay, but Touch ID has become so flawless and easy, and I do not see facial recognition being better or easier to use. If this comes to fruition, I will look at other mobile options. A fingerprint sensor on the back is better than none at all.
TouchID is like the headphone jack. Old tech. You need to stop living in the past. It's just like Apple to dump old tech in favor of design while still providing the functionality.