I disagree on two parts of your post:
On the contrary. Given the current political climate, states like Texas and Florida will go out of their way to make sure LCMs are legal there, and find some way to make political hay from being on the opposite side of California and Newsom.
Will congress get into the game at some point? Doubtful. The national legislature has been so dysfunctional for the last decade or two, I can't see them doing anything for or against guns in the foreseeable future.
No, as
Heller clearly shows, a means of self defense needs to remain. So it has to be possible to buy a functioning handgun, with a halfway reasonable magazine capacity (let's not argue whether that is 6 or 10, but 1 is right out), in a reasonable caliber. Just like

Heller was able to get a 6-shot 22 revolver, I think the common 9mm pistol will have to remain legal. Now, you may be right that eventually things like optics may go, but for now the basic meaning of the 2A as "must be able to defend oneself at home, and while carrying in public, with a functioning gun capable of stopping a threat" is not being questioned.
Now, if
Heller is overturned, and we go back to the
Miller situation (roughly meaning that gun rights only applied to members of the organized militia = the military + national guard), then all bets are off. And that's not as far fetched as some may think. As an example, see how the Supreme Court was wiling to overthrow 50 years of precedent in
Roe.