Re: Where there is a will there is a way
The most practical solution right now to a hydogen economy is to build new-tech, safe nuclear reactors. Someday, solar power (maybe from orbit) and other sources will also be useful.
Cracking hydrogen from fossil fuels works, but somewhere along the line you are still getting that extra carbon as a leftover (I'm not sure what happens to it in fuel cell systems that crack other fuels for hydrogen), and you are still burning a natural resource that would be much more useful in the chemical and plastics industries than as a fuel. (Actually, I don't think natural gas falls into this latter category.)