If there is no competition to a corp, consider the option of nationalizing it. Suddenly the prospect of being without competition will look far less desireable to them.
I guess that would make sense if the company without competition had a stranglehold on the industry and was taking part in anticompetitive behaviour to build a moat around themselves but as far as I know Space X isn’t doing this?
What would you expect them to do differently under this proposed scenario?