I just don't think it will amount to any change. It's too politically charged to attract any attention from those who don't agree with the facts already.
The media attention it's generated has been concerned with Gore taking another run at office, not changing America's habits.
Those people who waste gas driving SUVs to show the terrorists they haven't won are less likely to change their ways when Al Gore so prominently becomes the spokesperson against it.
I see it as a wasted opportunity.

How is that not a rational argument?

Maybe I'm just too cynical about anything to do with American politics. I just can't get too excited about this movie unless I see something coming of it in the real world, and I don't.