There is such a huge market of ways to improve flights that are between "what we have now" and "high price supersonic" that aren't currently being done; indicating that there's not a terribly large market for it.
Those who could easily afford supersonic can already afford other luxuries; the only one it gives is time; but if time is of the essence you can save it elsewhere by chartering your own jet.
> chartering your own jet
Honestly, this seems like the place to start with supersonic technology. The very wealthy are price-insensitive and would be ok paying 3-4x as much to get somewhere 2x faster. A good place to prove the technology, infrastructure, and market opportunity before cost-optimizing to try to get interest from mass-market travellers.