The Concorde used ancient technology and was never updated due to lack of competition. It was the last airplane to still employ a flight engineer.
Additionally the design was inherently flawed, which led to the AF4590 disaster.
The sonic booms were too loud due to old tech.
The post 9/11 slowdown was the nail in the coffin.
Finally, Mach2 just wasn't fast enough to move the needle. Mach5 is a very different story.
I think that airlines pretty much figured out the economics of air travel, look at the failures of the new 747 and A380s
For this to be successful they need to be able to fly a seat trans Atlantic at a similar price point than a 787 for example and I don’t think that’s happening anytime soon.
Imo a business only product will be a huge failure and with such a small cabin space is going to be scarce so I can’t imagine seats/personal space being the same than current business/first class products and I personally would rather sit in a j seat for 8 hours than a y for 2, but that could just be me...
But Hey it’s not slated until 2030 a lot of things can change till then