[shiroiuma]

The thing that killed the Concorde was a fatal crash that killed everyone on board.

The thing was already losing money because it guzzled fuel and was horribly loud and uncomfortable inside, while still costing a fortune for tickets. Not many people really wanted to pay 1st-class fares for worse-than-economy comfort just to shave a couple hours off the flight. Also, the plane could only operate at supersonic speeds over the ocean, so when it flew to/from Texas, it had to operate at subsonic speeds (and guzzle even more fuel because it was inefficient at those speeds), and the average trip time wasn't that much faster than a regular jumbo jet. It had been going downhill for a while, but that fatal crash was the end; they stopped all operations after that.

Sure, better communications might have contributed to its downfall, but that would have affected all air travel; just comparing like-for-like, the Concorde really wasn't a great alternative to the subsonic jumbo jets which became more and more prevalent for transcontinental routes.