Even one model that you could actually buy would be a start. As things stand, we have a handful of models running around the US and Japan, with 'wall/refueling station-to-wheel' efficiencies below that of BEV's, that you can't buy even if you were god, and have a handful of refueling stations available for use.

Not that it matters. Fuell Cells aren't robust enough for private vehicle use, and will need something of a breakthrough to become so. Niche applications are available, but enabling Mass, CO2-free Private transport isn't one of them.

I vote for the development of the onbaord 200KW, cold fusion reactor as the most desirable alternative fuel source for cars and trucks. Haven't quite got the heat to drivetrain converter worked out yet but I'm sure that the market will come up with it as soon as it sees the need!

Best hopes for cold fusion.