FutureCar series on Discovery Channel

I like this series a lot, but it seems to me that they lack the negative side of the technologies they talk about.

I don't know how major it is, but I remember reading about the Tweel some time ago.
Noise Problems
As indicated in the above Wikipedia article need to be solved to a better than current tires noise level - before these tires could be adopted by regular people. At first these tires are going to be more expensive than regular tires and if they are more expensive people won't buy them unless they outperform their current tires in almost every way.

But I still love the show. I can't wait for the future to arrive. Personally, though, I hope for arcologies without roads (and no cars) more than I hope for really cool cars. Like any American, though, I love cars.