Demand is demand. Why is it an issue where that demand comes from? If GM could sell 10,000 units to fleets per month and make a profit doing it, why would they stop?
I'm 6'2" tall 195 lbs and find that there is more than adequate room in my G8. In fact, I can not even put the seat back all the way to drive comfortably. The leg and seat room in the G8 is way more than anything else in its class. Not an issue for the average person.