If you are in some big rocks, I could see it being an issue. I'd have to disagree with having to throw massive tires on it to be functional though. Most moderate trails that off roaders do can be done in pickup truck. I don't see why this would be any different. You've got to remember, most of the off road and even Jeeping community aren't out doing serious trails all the time. I'd say most are weekend warriors out exploring and driving moderate stuff.
I would agree that for a 3rd row seating arrangement for a daily driver, this would probably be a viable option. I'm sure they will start offering crazy expensive conversions at some point.