All true. But if given the option to continue using it as an $800 smartphone, most people probably would. That would mean theyd be sitting there with their phone plugged in just like everyone else. UPSM is great for emergencies, I dont deny that, and I think that pretty much every phone should have something similar. But if the average person is near an outlet in an airport with their charger, theyll plug in instead of turning UPSM on, because they want to continue to play Angry Birds or check Facebook.
So the whole premise of this ad, while technically correct, doesnt take into account the actual use case most people want from their phone. Airports are not where people will be using UPSM. Stranded on the side of the road after their car blows up and their phone is about dead is where people will be using UPSM. Useful feature, though, and like I said, I think all phones should have something similar.