The opening post is a little too optimistic about Supreme Court rulings. The Heller and McDonald decisions were close decisions that only made it unconstitutional to completely ban handguns in the home.
I would be surprised if a majority of justices overruled many gun regulations. IIRC the Supreme Court has not been willing to announce the standard of review for gun regulations. Seems to me that is because the majorities in Heller and McDonald has one, two or three indecisive votes.
Do not be surprised if Kennedy almost always finds gun regulations constitutional. I think you should also not be so sure about Alito and Roberts finding many gun regulations unconstitutional.
Where Ignorance is Bliss, 'Tis Folly to be Wise.