They'll be hard-pressed to prove hardship, since the law doesn't come on the books until 2016.
Actually, I mentioned the Pennsylvania law as an example of what will happen in North Carolina. The PA law should have been in effect for the 2012 election, but was blocked by the courts because of concerns about disenfranchisement.
As I said, little old ladies testified to the difficulties that they had getting an ID card, though from the linked article, at least one didn't try very hard.
You can bet your bottom dollar that the same tactics will be used to block North Carolina's law.