If you are opposed to Real ID and live in a state that hasn't complied you might soon have trouble getting past the TSA.
http://www.nytimes.com/2015/12/29/b...e-state-drivers-licenses-for-travel.html?_r=0
It won't let me copy and paste, but the general overview is that of the non-compliant states all but five have extensions until October to come into compliance. The other fives states are either filing for extensions or subject to non-compliance and rejection at airports. The main option for travelers then will be a passport.
According to the article, it was the recent attacks in Paris and California that spurred this move. Never let a tragedy go to waste.
Federal government can make laws regarding things that are clearly state jurisdiction. The federal government and their supporters will push back on fears of encroachment by saying that it can't force states to comply. Sure, no military or federal police will march into your state capital and arrest the politicians, but they can use subversive tactics to make non-compliance a giant pain or a financial disaster.
The federal government doesn't use force, it uses lies, deception, money, and manipulation to make states complicit. No armies marching in, but a large group of armed thugs telling people they don't have the right to certain forms of travel does exist.
The worst part about this is that it is already fairly well known that the TSA is just security theater.
So, this will likely do little to help security at the airports and will mostly just force us all on to one more government registry. Why? Heck if I know. They got me on taxes, social security, any banking info, any phone records they want, and they already have records of my travel and possibly the fact that I always opt-out for a pat down.