Car of the Future

At the risk of sounding like Andy Rooney or Jerry Seinfeld: What is the deal with these Gull Wing doors?
As long as I can remember, every auto show has a prototype "car of the Future" which invariably is equipped with the futuristic Gull Wing Door. But have you ever seen a production car with these doors?? Outside of the DeLorean and a Mclaren SLR, they don't really exist.
And why is that? Why is it that almost every other cool car gadget has come to fruition, like GPS on your dash, integrated phones, heated seats, etc., but the Gull Wing Door? Nope.
Is it a safety issue? I mean, if you flip the car, you're pretty much screwed and it's not like these things are going on station wagons(Well,the Ford Airstream pictured here is breaking the mold, but trust me...).
Is it a convenience issue? Maybe they are impractical in cramped parking garages? And what if your battery dies?
They always seem to open with a whooshing Star Trek door kind of efficiency.Hardly worthy of someone manhandling the thing to get it open.

I think the real answer is this: Designers use the Gull Wing Door as an easy out. It's got to be tough coming up with daring new designs every year..what's a designer to do? I bet they just get to a point where they tell the intern,"Put some damn gull wing doors on that design" and then they go out for beers while the hapless intern slaves away.