The Feds have had my fingerprints for 8 years, because of a foreign adoption. In fact, they have two versions because my first fingerprints "expired" because it took so long for the adoption to happen. So they have an extra $800 from us-- Thanks USA! (tm).

Plus, as others have mentioned below, most conceal carry firearm permits will require it, at least here in Illinois.

So, the govt. already knows that I'm a registered Republican, they have my fingerprints (twice), they know I have a FOID (Firearm ID in Illinois), they know my travel patterns (via airlines, gas stations, etc).

I think the last of my worries is some fingerprint scanner on a smartphone. At least I won't have to type in my PIN to unlock it while driving...