On an individual level, I have a Ford Escape Hybrid. It's union built, in the USA, carries me, up to 4 other people, luggage or hockey equipment and can handle midwest/Rocky Mountain winters. I get twice the mileage I would have with a non-hybrid with similar abilities. I do hate the fact that the battery is going to be useless when it dies, not recyclable, but I was in a position to be an early adopter to support the idea that within 10 years we might get a really fantastic hybrid with more environmentally friendly chassis and battery materials, etc.
I keep looking at the Escape hybrid. I wonder, with this (and all other current hybrids) what happens when that battery pack dies? Like we're used to with laptops and power tools, I imagine the pack will just start to take on less and less of a charge as time goes on. So will your fuel economy slowly start to get worse? Does it degenerate nicely? Are you left with just a (slightly underpowered), essentially gas-powered car after the battery is dead? Can it run this way indefinitely, or are you always going to need to replace the battery packs every few years?
I think hybrid technology is a great idea, and if I just wanted to lease a vehicle, I'd definitely consider one. But to buy one and keep for a long time, I need to know the answers to questions like the above.