Agreed. SCOTUS hasn’t taken any good RKBA cases in 70+ years precisely because there haven’t been any. Each potential case has been clouded by other issues, and doesn’t help that most involved criminals. It took this long before a pure RKBA case showed up initiated by upstanding citizens. Justice Thomas has alluded to this, indicating that he wanted a real RKBA case, but had yet to see one.
Mariebl is correct - unless the court incorporates the 2nd amendment, states and local governments are still free to restrict gun ownership anyway they like.
What it could open the door to is more federal legislation.
In Silveira v. Lockyer (2002), the Supreme Court denied review and let stand a ruling by the U.S. Court of Appeals for the Ninth Circuit that there is no individual right under the Second Amendment to possess firearms. This ruling conflicted with the U.S. Court of Appeals for the Fifth Circuit's ruling in United States v. Emerson (2001).
Before that, I don't know. The U.S. Supreme Court did not grant certiorari in Quilici v. Village of Morton Grove (1982), letting stand the decision of the Seventh Circuit Court of Appeals that "possession of handguns by individuals is not part of the right to keep and bear arms."