They can, and they've already started to implement the new process.
It's about time, now we'll start seeing more fallout. Today's Dallas Morning News had an "interesting" letter to the editor. In a nutshell, he said he was a citizen, had been voting for 40 years without showing an ID, and no one was going to take away his rights now and make him show an ID to vote. His precinct might need extra security next time around.
Then Arizona better copy their laws - I understand theirs got shot down.
You think these states would cooperate and when they're going to propose a law, check with those who have one that passed the bar - so to speak.