It takes only 5 people to end gun violence in America.

[glatt]

Yeah, that's all interesting, but the Supreme Court already removed the whole militia part of the 2nd amendment. So a new Supreme Court would have to change that ruling to bring militias back into it, and then go on to do what you suggest.

The Wikipedia summary of the Supreme Court's holding in D.C. v. Heller:

The Second Amendment guarantees an individual's right to possess a firearm unconnected with service in a militia, and to use that arm for traditionally lawful purposes, such as self-defense within the home. United States Court of Appeals for the District of Columbia Circuit affirmed.