Up front, let me state that I have no desire to die on this particular hill, which is why I weasel-worded the hell out of my <conspiracy> block.
However, in this hypothetical scenario, the idea isn't to make it difficult to migrate away from "official" Fedora - it's to make it increasingly difficult to build a distro that is not, fundamentally, Fedora. And if everyone is building distros around Red Hat's quirky middleware, which distro is going to work best? Red Hat's, of course. Who are you going to hire to tell you how to manage the thing? Red Hat, of course.
(The logical extreme of this is the situation with Darwin. OSX's kernel+"middleware" is technically open source, but it's basically impossible to build an OS around it.)