I fear it might prove to be premature. Take for instance Japan Power Plus. If their battery tech proves to be true, then in a few years lithium batteries will be on the decline, and Elon will be caught holding the proverbial bag. Even if Japan Power Plus proves to be a bust, there is so much research going on in the field that it seems all too likely that some major new battery tech is around the corner. If Elon can't convert his Gigafactory to that new tech, he'll be hard pressed to recoup his $5 billion.