Elon said he was going to build a private space launch company. He did.
Elon said he was going to build an electric car company. He did.
Elon said he was going to build a $35,000 electric car for the masses. He did.
Elon said he was going to build a worldwide satellite constellation for Internet access. He is. Rapidly.
Everything Elon has said he was going to do, he has. He hasn't always done it at the speed at which he said he would, but he does always get it done.
He (meaning his team / company) will eventually develop a fully self-driving car. No, it may not occur at the pace at which he proclaimed, but I have confidence it'll occur.