Today, spaceflight just got much cheaper, and in essence, Elon is so far ahead of his competition, that no other company will be able to compete as far as cost with spaceflight for years.
So what does this mean for Tesla? Elon's pockets are going to get incredibly deep, meaning that in the event that the company sees any trouble, he'll personally be able to back up Tesla once again by raising his stake in the company. Knowing that the CEO has already wagered his life savings on the company keeps my nerves calm, especially at such a critical juncture.
This is a huge success for the entire Musk empire, not just for SpaceX.