Whatever the realities of the cost of solar, I tend to worry about a future in which we cover vast swaths of areas with solar panels and the impact such a thing will have on the environment. I don't know if anyone has done good studies on it. A bunch other sustainable forms of energy have environmental problems. Wind generators cause harm to birds, geothermal electricity sources like in Hawai'i raise the temperature…
Compared to the downsides of coal and gas and the risks of nuclear? I really don't think you should worry.