That’s true — but remember that going solar is a long-term investment. Gas is cheap right now, but the price of fossil fuels can swing pretty dramatically over time (and we’re at a real low right now with respect to oil prices). Furthermore, for better or worse, the cost of extracting, or more likely burning fossil fuels will likely increase in the coming 20 years. There is some pretty strong denial in the US about the science of global warming, but at some point that will probably change causing the price of fossil fuels to increase. Or it’ll result in subsidies for fossil fuels decreasing and going to foster more renewable energy sources.