Tesla right now does pretty well as a car manufacturer and the Model 3 will probably do well too, but by 2025 when the established car companies (like the German ones) have caught up, unless Tesla innovated far beyond those, it'll be a marginal car company - but a huge battery and energy company, as well as a "fuel" company with their supercharger networks.
I'm not sure whether you are referring to control or consumption, but in case it's the former: the cells Tesla uses are produced by Panasonic, so technically, they would be in control.
You mean just like Apple became a marginal tech company?
I find it fascinating how people make bold claims here in the comments, predicting the future like this...
A highly doubtful statement. At the time Apple released it, there were smartphonese capable of steamrolling over and over, just nobody sold them in US