No technology have everything priced it, just ask yourself what is going to happen when China (which has a near-monopoly on solar panels) stops to artificially subsidize them by their state to destroy the competition.
Uh... prices will rise instantaneously by the amount of the subsidy, then gradually drop as competition is restored? You seem to be positing a Giant Solar Crash or something, and that doesn't seem likely. Chinese panels are maybe a bit under cost now, but these are just not expensive devices.
