However, it doesn't mean that Red Hat is required to keep doing business with them, or that they are automatically entitled to receive all future updates.
As I said, GNU never said that the source code must be downloadable by anyone, anytime, anywhere in the world, from some public repository. It would be a completely valid business to sell binaries and then only provide the source code on request. This of course does not fit some people's idea of what free software is about.
There are of course a lot of ways that people can use to obtain RHEL source code even from now on, but I think that some people underestimate how much friction this can cause for the downstream derivatives.