It's obviously not going to be competing with prices from 60 years ago, it'll be competing with prices from today. Probably with first class tickets and private charter flights. I'm sure there's probably a suitable niche in there somewhere.
It's what a private jet charter costs now. I bet rich execs prefer that despite the longer flying time. Getting direct to your destination, not having to rub shoulders with random people, stuff like that. It's also what killed the Concorde. Not enough comfort for the price.