Keep in mind this fingerprint scanner is only shipping on ONE of the two devices announced today. For this to be the payments/security game-changer the OP is suggesting, it has to be widely available to the public, which Apple opted out of by not including it on the "value" iPhone 5c. Until every mobile device Apple ships has this built in, I think this falls a bit more in the category of a novelty... at least for th…
From the article:
I’m also guessing that despite its more homebound nature we’ll see that fingerprint sensor very quickly on the iPad too. The iPad is a perfect shopping tool and one-scan shopping would make that even more true.
I'm also betting it will show up on the new iPads.
So, if it shows up on everything but the 5C, maybe they'll just add it next year.
I'll bet there was some heated discussion at Apple arguing both ways, and it lost out in order to differentiate the high-end model.