Worse yet, the plane on display would not even "fly" as a cheap tourist trap. The Concorde may be a fascination symbol of stagnation, the absolute peak of the lighting fast development during the first half-dozen decades of aviation, a snapshot from just before progress suddenly stopped to be anything else than "same thing, just maybe a little cheaper". This is all very exciting for aviation geeks and people who like to think a lot about the younger history of technology, but those won't fill a restaurant. People who have never used the Concorde just don't have the level of nostalgia for it as some of those few that have.