The question at hand IS “in the home”. It hasn’t “been that way” in DC for 30 years.
“On the streets” will come later.
Actually the first question is "is it an individual right", then comes the extent of the right.
It's hard to fathom that if the court rules that the right is individual that it can be limited to "in the home". Not allowing bearing outside the home would certainly be an infringement on the right to bear arms, as not allowing them in the home is an infringement on the right to keep arms. Now they might rule that regulation of the manner of bearing is OK, and thus requiring permist for concealed carry is OK, but open carry cannot be prohibited, at least in public places.