The business man wants more flights a day to be able to go home earlier or later and accepts the terminal in that case or he or she wants to fly when she wants and will have to take the full aircraft. Having a premium ticket but spends more time waiting makes no sense at all....
Aso, but they won't be waiting more. You waste on average 2-3 hrs per journey in big airports when flying commercial, but it takes minutes to board private jet via FBO terminals. In terms of greater schedule flexibility you mentioned, this will just be another option among already available commercial, except with the added benefits of bypassing hub terminals and flying in a private jet setting. So, the businessman will in fact have more choice, not less. Not so? And why would they have to wait if they know they scheduled departure times in advance? In this regard it is no different to a standard airline itinerary...