It's "Sexy" right now. Of the "renewable resources" that I know of, I think that geothermal or wave power might have some potential.
I'm figuring that there will be something that we haven't even imagined, that will come along. Giant kite turbines in the jetstream, or a something-or-other that grabs energy from hurricanes or lightning bolts and stores it for months. Real Star Trek type stuff.
Problem is, there's a lot of very smart people looking at Solar or Wind, instead of ideas that actually might go somewhere eventually.
Yes, if only there were some way to harness the power of the atom!