I'll take the bet. I say this thing flies, makes it to production, and somebody somewhere will run one or more profitable routes with it. My guess is that Boom secure some licensed tech like NASA's "Quiet Spike" and likely some prototype level propulsion tech, and we already know that materials today are lighter, cheaper, and stronger than Concorde-era materials, etc...
Total sideline speculation, since I haven't seen any specifics about targeted list prices or operating CASM, but I see both Branson's and JAL's investments as positives that there must
be something to the numbers to make publicly floated companies throw down some dough to back the effort. I'm positively curious at the very least.
"Great spirits have always found violent opposition from mediocre minds." - Albert Einstein