Ok. Just to play Devil's Advocate: What if those people had gotten off the plane out there on the tarmack? Blizzard. Ice. Power failure back at the airport. People not dressed for the weather or traction. People physically unable to make the walk back. Poor visability for everyone - passengers, crew, the other vehicles between them and the terminal...
Dont cha think there may have been a few issues? Maybe a lawsuit?
I agree that 7 hours is a long time. I would have hated it. It would have been uncomfortable. But was it really an emergency? Any moreso than the other planes the airport crew was dealing with?
Frankly, I think I'd rather get to the terminal in the plane than on foot, even if I had to wait in that thing for 7 hours with my ADHD kiddo.