There is a point there with respect to the sense of the bill of rights but you run into the problem with the black and white text in the 8th amendment. If they had intended to ban bail, they would not have instead set limits on it. That's a hard argument to get around. Far harder (logically if not politically) than banning handguns under the 2nd would be.
When you have an internal logical inconsistency you probably need (or at least should have) an explicit amendment to make the change. I know - the amendment process is broken, but that's not the founders' fault.