I think our energy needs can be more robust going forward with a mixture of sources. So long as there's natural gas in the ground, we'll burn it. But we'd be in a stronger position if gas was supplemented by large amounts of solar and wind, as system and price stability is greater when diversity is high, I believe. I know if I were building a house from scratch, I'd definitely have solar panels on it. Unfortunately, the gable on my roof isn't well suited for them, as my hose was built back when not even Jimmy Carter was considering solar. I still think that delivery is a bigger problem than production. Solar on a rooftop is convenient, because you don't have to worry about transmission lines. Even if we could block a 10,000 sq mi tract in NV, we couldn't deliver the energy to NY, because line resistance is too high right now. Someday, someone is going to become a billionaire many times over by inventing a high temp super conductor (remember Airbus's electric plane that's predicated on a high temp super conductor, lol?). That would be a game changer, if it's not a fantasy.
In my opinion, photovoltaics haven't crawled up Moore's Law to the point where they make sense for individual investment. SolarCity is arbitraging renewable energy law to externalize the cost of solar ownership to the government which, really, is worth doing. The grid's a mess and has been. HVDC may clean up some of it but local power production is a better solution. Frankly, energy efficiency is the solution.