it is proof that rich people or whale still has power to influence or manipulate bitcoin price. I think is a good chance for other rich people to buy btc at lower price. He is not the only one rich person in this world, maybe if other rich people see opportunity to earn profit in bitcoin investment then they will get involved in it.
They don't have that kind of power directly, and still I don't think that Musk's intention of selling bitcoin was to create a scene. We don't know about the actual financial health of his company, but that could be a reason.
Bitcoin circulation is too widespread,Elon musk can only influence his followers sentimentally, as can other bitcoin whales.