im guessing if you really need, and can afford, supersonic travel then either it'll be like flying business/first or you'll have top tier ff status with the airline, and queues etc are much less of, or even a non issue.
Exactly this. Supersonic flight is likely to be more expensive than subsonic flight, and will likely mostly be used by people that fly regularly. Even moderately frequent travellers don't find airports that much of an issue because a) their status allows them to skip most of the horrible parts, and b) they have learned how to travel efficiently.