Supersonic was killed by the dual shock of the oil crisis and the regulations banning sonic booms from overland flights. Which, to be fair, were pretty terrible, or at least were horribly managed from a PR point of view. https://en.wikipedia.org/wiki/Oklahoma_City_sonic_boom_tests
Concorde was really in the wrong place, at the wrong time, and with not enough of a big market. It didn't fly far enough for it to make a big enough dent in travel times, and it turns out passengers don't mind six vs three hours on a transatlantic hop if they get to spend it sleeping in a redeye in a cushy lie flat seat. If it had been capable of making the transpacific hop, I suspect it would have had a successor even with the sonic boom problem.
Concorde was really in the wrong place, at the wrong time, and with not enough of a big market. It didn't fly far enough for it to make a big enough dent in travel times, and it turns out passengers don't mind six vs three hours on a transatlantic hop if they get to spend it sleeping in a redeye in a cushy lie flat seat. If it had been capable of making the transpacific hop, I suspect it would have had a successor even with the sonic boom problem.