I think it's a bit naive to say natural gas is an effective option for those seeking to avoid boom-bust price cycles. Just a decade ago the US natgas price market was incredibly volatile and expensive. True, shale gas has changed all that, but the price of natgas is already on the upswing and coal is elbowing back into the mix. Add to that expected increases in domestic demand through the current generation buildout/transportation use, and international demand through LNG exports, and prices will almost certainly rise.
Multiple reports predict grid parity for solar in the very near future, and obviously there's zero cost of the commodity once installed. True, government subsidies are helping drive installations, but the shale revolution was also funded by government research grants and loans. This is just the evolution of energy generation, and Arizona is getting left behind in an industry it should be leading.