It probably depends of how the new features will 'replace' the touch-ID. Maybe for payments it will be enough just to hit any 'pay now!'-button on the screen or on the Apple Watch as the new Infrared/Laser/whatever-sensor already captured your face a moment ago, so you might still confirm a payment by touching the touch-screen, but no need to touch the touch-id-button anymore. Or maybe they'll add some voice recognition, i.e. you confirm payments by saying "pay now" or just by simply nodding your head. iPhones/smartphones changed the way people behave (like everyone's starring at their screens at the public transport, in cafes and restaurants instead of talking to each other or reading newsPAPERS), so maybe this new technology will also change the behaviour of how people will pay...
Just imagine if you're waiting at Starbucks and everyone's confirming payments by nodding or shaking their heads or shouting 'damnit, yes, pay now for that damn overprized coffee'...