... If it wasn't for those re-usable filters. Saving money, and keeping plastic K-cups out of landfills is a great part of it, sure. The real reason is that my favourite locally-roasted coffee just isn't available in K-cup format. I rarely want to brew a whole pot, and like the convenience of not having to constantly clean a press.
Needless to say I will not be buying one of their new brewers, unless I can use my own coffee.
Actually a 4-digit password only has 6,561 possible combinations, whereas a fingerprint is close to infinite, since it's really comparing sections of a large bitmap.
What's more likely is that someone will find a way to fool the fingerprint scanner-- with an object (mold/photo/gel/etc), by hacking how the scanner communicates with the device, or by breaking the software on the device itself.