Every major idea for alternate fuels is practically impossible (and when you take the human condition/profit/tradeoffs/greed into it, completely impossible) and the tradeoffs are all horrible with anything other than solar.
Biofuels cause food displacement, land clearing, and are a net "bad" for the environment. Plus they would force people living on subsadies to work for a living and they have lobbies to prevent such things from happening.
Hydrogen is dangerous to store, and ALL US hydrogen regulation plans have language making it illegal to refill your car at home and the requirement for all hydrogen cars to have proprietary fittings that you can't "just tap into" (Ie you can't make and compress your own. ( that cuts into business profits and taxable income so it won't happen.) They'll set an arificially inflated (no pun intended) price on it and while it may potentially be better for the environment, unless you're using solar to create your hydrogen,..you're still burning power somewhere in the mix.
Solar is free, safe, and easy. Efficiency on solar panels grows daily (and as mentioned in another article) the US has no shortage of space to put solar panels/farms/arrays
The only way to change to ANY different fuel source though is to be able to fix the price of oil and obtain it from non-foreign sources.
If oil was at a set price (even a high set price that could only go down) that would allow enough stability politically to be able to truly invest in infrastructure. (if you're paying $3.00/gal today and prices drop back down under a dollar US citizens aren't going to be falling over themselves to invest in alternate fuel.
Go with something like changingworldtechnologies, (Someone explain to me the US government is roadblocking them at every turn again??) get our mass gas and oil from recycling (killing two birds with one stone) fix the prices and wean ourselves off slowly (domestic production would insure price and political stability and maybe get us out of the Middle East)
After we've developled and implemented solar/nuclear infrastructure we then sell off our excess to the rest of the world at a profit as well as insure dirt cheap oil for the things that still need it. It would take about 15 years or so to get "in full gear" but it would be 100% beneficial. The only people who would lose out would be big oil and those who have their bread and butter based on ties with the middle east.
Unfortuately they alone weild enough power to topple governments so.... cest la vie.
That's the best plan I could come up with and while it's a LONG TERM solution, I think it's about the only one that could actually work in the real world.