So Congress may impose a national concerned carry ban pursuant to the 2nd Amendment, by your "logic". No wonder you and Sarah hate state laws so much. They stand in the way of your dream of centralized power imposed by judicial fiat.
Technically, yes. But then everyone would be free to open carry. They cannot forbid both. Further, such a concealed carry ban would only apply to those acting as active duty militia under Art 1 Sect 8 duties of Congress.
For everyone not subject to active militia duty, they can Constitutionally carry what they want, when they want, however they want, and be within the 2A's protection.
Getting the courts and various States who have over stepped their legitamate authority is what fighting for Parker/Heller has been all about.