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To make supersonic commercial flight viable long term, a number of things need to happen.
>Vastly more efficient supersonic engines
Advances in supersonic capable engine efficiency have been almost non-existent compared to conventional turbofans, which have gotten wildly more efficient and quieter in the past 60 years.
>Sustainable jet fuel, hydrogen power, or similar
You could also theoretically use some kind of mass produced alt fuel to lower costs and impact if you could sugfienctly scale it
>Much larger aircraft
65 to 88 passengers in an all-buainess/first class configuration just isn't going to work from a business perspective. You need much larger passenger capacities, equivalent to what today's various airliners have.
>Notably longer range
These have to be able to go trans-Pacific non-stop. At a minimum between the North American West Coast and Japan, Korea, Taiwan, and China.
>Quieter design
Even if overflight rules are somewhat relaxed for sound, they aren't going away. You need a design that can not only reduce the sound produced by going supersonic, but you also need an engine design that isn't also loud as fuck as subsonic speeds.
>A totally different business model for airlines
There's a reason all-business/first class configurations are virtually non-existent. Airlines rely on have a mix of fares on flights (yes, even LCCs and ULCCs) and ability to upgrade within the same flight to make them worth flying. You'd either have to buy a ticket specifically on a supersonic flight or use a reworked points/status system that would put you on an entirely different flight at a different time and charge you a lot more than an upgrade on a normal flight.
