Boom is bringing to the table that the technology has advenced in the last 50 years and even the Concorde might have succeeded, if a second iteration had made it to the market. Also, partially the Concorde failed because Boeing opposed it. They were working on their own supersonic plane but were a few years behind. Unfortunately, they were so successful in blocking the Concorde, that their own project failed as the market had become convinced that supersonic flight doesn't work out.