Re: 80 passengers?
It's an engineering marvel that will never be economical to run.
First, even if the ticket price were "just" 5k, there's a limited set of business and first class travelers willing to splurge on saving a bit on travel time. When you have the choice of 5 hours squeezed into a tight seat versus 10 hours in a fold-flat bed, and the ability to charge those extra 5 comfortable hours as overtime, what do you choose?
Second, you are saving significant time only on non-stop flights, and there will be few of them. If you have to connect, most of the time saved evaporates. Now the total time is 8 hours instead of 10, for triple the price.
Third, because of the factors above, only a few number of these jets will be built. Economies of scale will not apply, making the plane more expensive to build and run. All those airline options will evaporate when Boom will be unable to keep its promises -- just like Branson's pre-orders did.
This jet will certainly find a niche as a toy for the super-rich, though. "Nyah, nyah, your puny Gulfstream can't even go supersonic!"