Tesla is sure to play a major role in helping Elon to archive this but I doubt it would take Tesla alone to hasten the process. He would get there apparently but, he needs other lines or streams to make it sooner.

Tesla is big business and it ain't cheap. Trying to make gasoline go out of business with th aim of promoting only renewable electricity supply system simply means, you e got to ensure your products becomes affordable even below the middle class and that is being unrealistic with the price of a Tesla at the moment.
It's important to know that, those little money do count. Aside from Elons view of free speech, I think this is one of the reason he went to acquire Tweeter and gets those cent or even less than per tweet.

Haven't said all that, we ought to realise one thing for sure and that is, Elon is sure getting to the trillionaire spot. It's just going to take some time.