Many, many have. Just not by the U.S. Supreme Court.
For example, all cases concerning state firearm laws presented to the federal appellate courts were rejected since the second amendment wasn't incorporated and didn't apply to the states. With incorporation, all of those cases can be retried.
All of the federal circuit courts can now hear cases regarding state gun laws, and all the federal circuit courts can give their opinion.
Well, we can probably count on the 5th Circuit and the DC Circuit to rule favorably. That leaves the 1st Circuit, the 2nd, the 3rd, the 4th, the 6th, the 7th, the 8th, the 9th, the 10th, and the 11th -- all of which have previously ruled a collective militia/state right.
2 against 10. Two say concealed carry is part of "to keep". Ten say it's not. It goes to the U.S. Supreme Court. Five justices decide for the whole country. I don't like the odds.