Personally, I see hydrogen being quite a ways out for a practical every day daily driver consumer vehicle. Gasoline cars should start to decline in the coming years, I can see diesel taking over first just like how it has in Europe. From there, electric cars will take over and then other alternatively powered vehicles will lead the pack.
Personally, I love
Volvo's V60 Plug in Hybrid R-Design
Diesel plug in hybrids will be the "next big thing"