We've essentially made the court say that registration is a valid measure of gun control and is acceptable under the Second Amendment. How's that going to work for us?
If nothing else, we will have some idea where we stand. If they rule a complete ban on usable firearms in a home is unconstitutional, and I think that is likely, that is the baseline we start with. Right now, we don't even have that.
I'd love to have the right (or privilege even) to own a relatively inexpensive FA firearm. But I am not sure the RTKBA actually means you have the right to buy FA firearms at a reasonable price.
Another court might well decide that "arms" is plural so you have a right to more than one. Good thing, right?
It is entirely possible that at some point a court could rule that knives are arms, so you have a right to won them as well. Good thing, right?
Another court might well decide that since the 2A says nothing about being allowed unlimited numbers of arms, and two is plural, that a limit of two is acceptable. Not so good.
Pretty soon a court might well rule that steak knives are arms, and if you have 2 steak knives, you have your constitutionally mandated "arms" and are not entitled to anymore. Very not so good.
Thats why this is going to be a decades long run of court cases to flesh out just what it means, assuming we win this one with something meaningful.
Personally, I would bet a lot of people are more worried about the collection (aka arsenal) you have in your basement (you know those 3 bolt action milsurp rifles, your granddad's shotgun, and that 22 pistol your uncle gave you when you turned 16 40 years ago) than whether you have a FA firearm or not.