As Seaoat indicates, the price of fuel is driving taxi companies in Chicago to hybrid vehicles. There will be a point where the price of petroleum will drive the conversion to new modes of transportation, and even new modes of living.
We will produce a lot of oil from America's unconventional shale formations for the next 20-30 years. However, those barrels of oil will also peak and decline like conventional oil formations are now so doing. Dollar inflation and the high price of extraction for unconventional oil will ensure that the price of oil keeps climbing. The transition to even more hybrids and electric vehicles will only grow from here. At some point it will become economically unfeasible to run internal combustion engine vehicles, and they will fade into obsolesence. There will be a lot of kicking and screaming from people who don't want to move on from the gasoline-powered car, but even they will eventually face reality.
What I would like to see is the new generation of Tesla-quality electric vehicles that will be driverless. The vehicles of the future are going to be so advanced that nobody is going to want one of those old-fashioned rides.
all of this is going to be good. One day, I hope to mostly power my house with a set of Dow PowerHouse solar shingles, with our main vehicle being a plug-in hybrid. The next time I need a roof replacement, I will be at least considering the former. I looked it up online the other day, and a 13W PowerHouse solar shingle costs about $52. I would likely need about 300 of them, so the roof would not be cheap. However, it would pay for itself in about 10 years, and deliver savings after that for several more years.