Now consider what's changed: Back when Concorde was new, airline security was perfunctory and brief, so the time spent in the airport was a fraction of total travel time. Today that represents potentially 2+ hours of your travel time that can't be omitted. For much of Concorde's life the modern internet wasn't a thing, or at least mature; every business traveler didn't have the ability to have a conference call IN MID FLIGHT. Today that's routine.
So what's the hurry exactly? Sure some people might have a need or desire, but the planned jet holds 64 people who are going to have to pay through the nose to make it profitable for an airline. Who are these people who wouldn't rather take a sleeping pill or futz around on their laptop instead?
tl;dr Supersonic civil aviation is an ECONOMIC problem, not a technological one, and the economics haven't changed.