I suspect after the recent shootings that you will see "waiting periods" will become the norm. My guess is that it will take weeks, even months, to get "approved" to purchase a gun. I for one will not be completely opposed to it, on the other hand, I'll be purchasing a few more guns in short order so I won't have to deal with it.
Here in Ohio I can still go into the shop and walk out with a gun in less than 1/2 hour.