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To expensive to operate, you needed a lot of fuel to flew few passengers faster, they decided regular airliners were fast enough.
They needed 3x as much fuel as a 747 per passenger. The Concord was also banned from flying over cities because of the noise, this pretty much limited it to routes between east coast and Europe.
But now, I wonder if supersonic flight could work today. We know a lot more now than we did when the first Concordes were built. There have been numerous advances in the fields of engineering, materials science, avionics, and such since the last Concorde jet was grounded.
Boom Supersonic is a private company working on it, with an eye towards better fuel efficiency than the Concorde. They're still in the early stages, though, so who knows if they'll actually be able to finish a design, much less manufacture a working model.
And NASA has been doing some research on sonic boom characteristics, to see if a plane can be designed to fly faster than the speed of sound without causing a sonic boom.
In the field of aviation there have been almost no innovations except better electronics and manufacturing techniques.
All old principles still hold. Going faster requires a ton more energy.
Boom supersonic is trying to bring supersonic passenger flight back. They have a test bed prototype that flies out of a Colorado airport. But last I heard they were in big trouble without an engine supplier.