I highly doubt tens of millions of those who fly would need one. I imagine that the vast majority of Americans WHO FLY, possess passports. Remember, most people rarely or never get on a plane. Getting a passport card with your tickets would just become part of the process if you live in a non-compliant state.

I'm not saying it's good. It's awful. "Papers, please" - just that the headline is misleading clickbait, no one is being "grounded".