Like I said, I'm not sure. The vast majority of people I know who have an Air or MBP have an older model without Touch ID. They might appreciate it if it is there, but they won't miss it in its absence. The only two people I know who've ever owned one that had it both returned it because they otherwise hated the device.

For me personally, Touch ID makes sense on a phone, because I can do it with a single hand. For a laptop, I'm going to have my fingers on the home row anyway, and typing in even a complicated password is fast.