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This is the problem with energy debate... it's hard to predict what future tech/science breakthroughs might do to current fuels. Realistically, if some billionaire pumped tons of money (X-Prize style) into solar powered vehicles that are usable year round in all places... it could be a reality. The other problem is the idea that any one fuel is perfect for all uses. If you could make wind-powered buses for mass-trasnit, and left it at that... that segment would drastically improve air quality over time. Look at hybrid electric cars such as the Prius. It still uses that "terrible" petro, but in reality, it's a good car. I don't expect to see electro-hybrid semis anytime soon, but if everyone drove an electro-hybrid, our energy problems would be FAR far less...
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