Despite Secretary Chu and President Obama looking to drastically cut and slow down the development of fuel cell and hydrogen technology, fuel cell vehicles seem to be growing and progressing faster than ever. Mercedes-Benz recently bumped up their FCV release date to 2014 from 2015 stating,
Toyota is still planning on mass producing their FC Highlander in 2015 and GM and Honda have stated that they will follow and be releasing vehicles in the same time frame.
It appears that the fuzzy future of alt fuels for transportation applications is becoming more clear. The only problem now is developing the infrastructure. While the US is doing diddly-squat to create a hydrogen fuel infrastructure Europe and Japan are well on their way to support hydrogen technologies.
I think the answer to the question "What will replace the ICE powered car?" is quickly becoming Fuel Cell Hybrid Electric Vehicles (FCHEV's) with a mix of a BEV's owning a small portion of the market. Now if we could just get our act together maybe we can make this transition quick and painless.