If it means selling out to a traditional automaker or a big oil co, I doubt it. Doing so would mean leaving everyone who drives a Tesla out to dry. He won't settle for "an opportunity" -- he wants a lot more than that.
That's why I said that if it were to come true. It will originally have to be disguised as an offer from Elon's tech circle. There's too much enmity between Elon and big oil/car for Elon to sell to them.