All of my immediate and extended family now relies on the fingerprint scanner to keep the kids off of their phones.
People will be expecting this going forward and will pass on phones if it doesnt have it. Not to mention that we are close to having it built into the panel.
And don't forget, Apple now has 3 generations of devices with this tech, and it's not going anywhere.
In two to three years, every functional Apple mobile device will have the capability.