I think the world of business travel has changed quite a bit since the Concorde. The amount of companies willing to pay for first class compared to years ago is much different I suspect. Pre-Covid we've had over a decade of corporate travel tools (sup fellow Concur users) that scrutinize your flight selection and flag any flight that is outside the bounds set by your company (what do you mean you don't want to wait 8 hours to take an extra hop and wait for a connection? Please justify this). Certainly there are a few company's who will pay for the upgrade for a flight over X hours, but a Concorde flight was always a top tier class - not an upgrade to business.