While it may not happen in our lifetime (yeah, you, you old SOB you), it will certainly happen during the lifetimes of the children being born today: Electric cars will get most people from here to there.
And, really, there are no downsides to this. We'll still have road freedom, but we'll have no pollution from the operation of these vehicles. Our nation (and nearly all nations) will no longer be held hostage to those with the fuel needed. Because it will all come from the sun.
Meanwhile, we're busy working on a new sun-ray device that burns off clothes without harming the delish below.