Sure he is wrong but it will cost big bucks and a lot of time to prove it. If you read the correspondence from the founders there isn’t any doubt what they meant by the 2nd amendment. It shouldn’t take a process by SCOTUS to make the meaning clear in the first place, but when they make a decision they should engrave it in granite!
I share your frustration with the process. But I think that you would take the opposite tack if the decision had gone against us. Then, I think, you would support having the Court make the narrowest possible ruling given the facts of the case, and leave it to later Courts to expand as necessary for the newer cases.
From an historical perspective the combination of the Heller case and the McDonald case is about as fast as I could possibly imagine this process going. If not for the possibility of Kennedy continuing to support the right to keep and bear arms, I would be in favor of the Supreme Court doing nothing. It's not yet bad enough to kill a million Americans in a civil war. At least not over gun rights.