I don't believe for one minute that the supremes will let the inner city gang bangers be legal by allowing open carry.
Well, gang-bangers don't care about the law in the first place, so a ruling from the Supreme Court will be largely irrelevant to them.
That said, when it comes to carrying a firearm in public, the court will
listen to arguments about potential public-safety consequences, and it will
have an effect on whatever opinion they reach.