The true potential of TouchID

I've been thinking about what the real use case for TouchID, which on the surface is used primarily for security. Now that TouchID has been in use for a while, other uses have been created; however, I don't think that any of these uses actually touch on the true potential of TouchID.

Updating iTunes when listening to Pianobar

For the past few years, I've been using the WSP Music System for iTunes to help me listen to things in a better manner. But that means I need to keep my play information in sync.