Does this make solar a great industry to invest in because of the growth potential, or a terrible industry to invest in because the prices are racing to the bottom?
If you pick the winners, investment will have huge return.
Most solar companies, however, will be casualties in the fierce competition to come.
The other area to look at is energy storage. More renewables will increase the demand for energy storage. And it's early days in that field. Again: Huge returns for the winners. But most companies will be shaken out of the field.
As Ramez said, you don't bet on an "emerging industry", you bet on the winners in that emerging industry, otherwise you may very well lose your money. When new industries are born there are usually hundreds of competitors in the beginning, but eventually only a few big ones remain, and it's usually those that started early and got big early.