They actually set this up pretty far in advance though. For instance, I'm from Texas, where any IDs issued since October 2016 are complaint. It's impossible for me to have a current ID that's non-compliant.
So from my perspective there won't really have been any changes since 2001 in my flying experience.
I worry about this: https://www.dhs.gov/real-id but from the website, it seems that many states id/driver licenses are "REAL ID compliant" and you only need it if you fly domestically or wanting to access "certain federal facilities".
I don't know, all I know is that my driver's license is already compliant with that, I think. All I had to do is bring a few extra things to the BMV when I renewed the license. I didn't really think much of it at the time but it's one of those things that's nice to have and didn't really cost too much extra.