Concorde had several major issues that Boom might not face [1]:
- Boom. Boom supposedly targeted a 10x noise reduction for its sonic boom compared to Concorde, but whether or not it can convince the FAA remains to be seen.
- Lack of bodies that could reliably fill seats at the ticket prices. Boom is targeting current business class ticket prices, and the plane is half as big as the Concorde; 55 seats is around the size of a current premium class cabin.
- The wrong ocean. Flights across the Atlantic are not that long; six hours is a reasonable night's sleep from NY-London. On the other hand, the Pacific is massive; even Seattle-Tokyo is 12 hours. When Concorde was built, Asia wasn't rich and they could only convince Air France and BA to buy them; today JAL is investing in Boom, and there are probably people willing to pay a premium to halve 12+ hour flight times from the West Coast to Shanghai, Beijing, Seoul, Tokyo, Singapore, etc.