[ProDigit]

Personally, I think, unless we re-invent the gasoline engine, hydrogen is out of the question.
I watched Mr Shouty's vid, and couldn't agree less with it.

A while back, there was big research done on alternate engine types, like the Duke engine, or the wave disc engine.
While the duke runs very nice, it's longevity is been questioned, since it has rotating cylinders that would most definitely cause centrifugal wear.
The wave disc engine, while it can't be used in variable speed scenarios, would make an excellent driver for a generator at a fixed load!

The wave disc engine would be much more efficient than even a rotary engine; if the rotary engine was only still manufactured today!

There is a future for the wave disc engine in generators, due to it's small size, high efficiency, low weight, simplicity and low cost.
And we all know generators have a future in electric cars.

Perhaps a wave disc engine would go well with a CVT, varying the output speed at a fixed input rotation.

Anyway, fuel cell is out of the question for the future.
And Electric is an emerging market, but research has determined we already are running at ~96% efficiency on lithium batteries.
Chances are very low we will find alternate forms of storage that would improve on Lithium.
We all know that electric cars cost about 1/3rd too much. They're only good for Europe, where gasoline costs 3x as much as here in USA.

Research indicated (youtube), that in the UK, and with $10/gal of fuel cost, an electric car would get out of the initial cost within 50k miles.
In usa, this is well over 150k miles, or the lifetime of the vehicle.

And about 400k miles, if you need to purchase a new battery from the dealership, as for the price of a new battery, you can easily get a new 4 cylinder car ($20-26k).