Slight thread drift, but many predict the next supersonic passenger aircraft will in fact be a biz jet - catering to the 1% (or more precisely, the 0.01%) for whom cost is no object. Not only is a biz jet not subject to the same financial limitations as a commercial airliner, the regulations are a bit more relaxed in several areas that would be relevant for a supersonic aircraft.
My educated guess is that we'll see a supersonic biz jet in service in the next ten years or so.