Hey there all eco-freaks! Take Physics 101! Reality is a bitch - get educated or shut up.
The only way that hydrogen gereration is possible as an economic alternative to natural gas is to use solar cells by the ocean for its generation. I doubt that it would ever be cheaper than bio-mass sources of methane.
Wind is still insignificant and unreliable, but it is growing. Solar cells are still expensive as diamond jewelry, but that should continue to develop slowly as well. Nothing on the horizon will touch oil/natural gas pricewise for a long time. Maybe coal gassification is the next serious source.