if they revive the noise implications they might well manage to change it. IMO those restrictions are also because it wasn't an American jet so it kept the competition out.

Agreed on both points, but they're fighting against the physics of sonic booms, not just Concorde's noisy turbojet [a solved problem] so I wouldn't bank on it, and lobbying against Boeing as well as an environmental lobby that's far more influential now than in the seventies.

Several European states without commercial airframers introduced supersonic overflight bans too and the Anti Concorde Project started in the UK so I don't think the argument it was all protectionism stands up anyway.