I wouldn't compare the Sonic Cruiser with the Concorde. It's a complelty different design.
If the Sonic Cruiser will become reality, and if it will be fuel-efficient, it could become a best-seller, which every airline will need to stay in the business.
It could bring the same revolution as the first jetliners, which replaced the propliners. Of course, it will need some 5-15 years until the Sonic Cruiser will become a "must" for the airline, but who knows, perhaps the SC will be the future of aviation...