You'll definitely care when you're struggling to pay the legal fees.
Besides, what happens if she has to call the cops and they walk in to find her holding a gun, or you get hurt while you're carrying a gun and she has to take posession, or you die and the guns are left sitting in the estate? Hell, apart from the worst case scenario, there are plenty of likely situations in which your wife may find herself in possession of a firearm or related paraphernalia. What happens if you buy a box of ammo and forget it in the car, and she gets pulled over driving the car? Even an empty shell case on the floor board is a violation.
Besides, how effective is she going to be defending herself and the home with a gun if she can't take it to the range and shoot it?
Conclusion is that there are a lot of very good reasons why the wife of a gun owner should be licensed. If the two of you are smart, you'll get her licensed.