With Concorde the bang was not the only problem. I am not sure it was able to join a stack before landing. It got priory to land without any delay. And at low speed it was very noisy. Those sort of issues need to be considered given the minimal benefit on internal flights.
Such a propaganda move. Boom was already being officially tested which means the rules change was already going through the process. "Do the thing you were going to do, I command you."