Personally I don't see the allure of supersonic passenger flight. Let's not forget the the Concorde program was eventually scrapped instead of new supersonic jets being developed was not because it was cost prohibitive to fly (and at $10k+ per ticket, it sure was), it was because there just wasn't enough interest in shortening an 8 hour flight to a 4 hour flight, and it's basically impossible to fly supersonic (and civilian) over the continental US, so it will likely never help with New YorkLos Angeles travel.
Between the jet lag and the fact that it still eats up an entire workday, nobody in the end really cared for the faster trip. Now, it was a horribly uncomfortable plane to be a passenger on, and credit to Boom if they solve that as it might make some difference, but I just don't see that being the "killer app", as it were.
The "killer app" would be turning a LondonNew York flight into a commuter flight - as in, fly there in the morning, and back in the evening, so a meeting on the other side of the pond takes only one day instead of two. Shortening the flight to 3 or 4 hours doesn't accomplish that.
Now, if we could get to mach 3 or 4, now THAT would be something. Now it's a 2 or 3 hour flight.
Now, all that said, it has been twenty years since we had supersonic transatlantic flight, so perhaps someone can come along and do it better. But I'm not holding my breath. I don't see this service as ever being economically feasible.