Once you use it I think you'd see the value of it. Simply because it's faster than drawing a pattern or entering a passcode. I really miss it on my iPads, but it's totally a convenience. In 18 months when I'm eligible for my iPads' NEXT upgrades I'm sure it will be on the then-current models.
The thing that strikes me about Touch ID as a feature is that if it were widely available on, say, Samsung or HTC devices in an equivalent implementation that is used on the iPhone right now, but indeed not available on the iPhone itself.... I believe many android users would be singing its praises and pontificating how the iPhone was so so so far behind because it didn't have the feature. Instead, because it is an iPhone feature many, no...not all, say its a useless gimmick. Perhaps my perception here is mistaken.
Sent from my liberated Titanium iPad Air LTE