Problem with turbine vehicles (from what I've seen) is a total lack of torque and a slow spool-up time. They're cool, but I can't see them being used for everyday vehicles, or at least not of the commuter type - maybe industrial and/or sports applications, perhaps. Those turbine jet-powered motorcylces are awesome to behold, and have a theoretical limitless top speed (the faster it goes, the more air it sucks in, and the faster still it goes), but owners like Jay Leno have said the thing about them that spoils it is that romping on the throttle is a slowwwwwww deal, like a turbocharger in slow-motion. Well, that and the fact that when you start one of those things up, people are looking around for either a helicopter or a Harrier jump jet to be taking off somewhere nearby.
Also, I'm not sure how/if hydrogen could be used in a turbine application.
Just had a silly idea: what about a return to STEAM power?
You see, back in the days of old, everyone used to burn stuff like coal to generate heat which would turn water into steam which would, in turn, power large pistons and such to create motion. So, you use radio waves on water to release the hydrogen and burn it (a reaction which, presumably, bonds hydrogen back with oxygen and again creates water). Use the thermal energy from that reaction to not only heat up water to create steam but also harness some of that to generate electricity (to power whatever device creates the radio waves for the initial reaction), and ... ta-daaaaa!
Of course, a hundred years or so in the future, you'd see a buttload of people moving towards the coastlines to get their free refills of salt water, up until the Federal government decries that they own the friggin' OCEANS, fences off all of the beaches, and starts charging people for salt water by the gallon...
Okay, so who wants to help me convert my Mustang over to radio-steam-power?