Red Hat doesn't have influence over the development of Fedora, that's the job of FESCo. Red Hat owns the trademark and is one of the sponsors of the Fedora Project, but their interest is solely in enterprise applications (a task that is not suitable for Fedora), not in consumer desktop platforms. I've already discussed this at length here and here if you'd like more detail; there's no point in rewriting it.
It's probably not gonna happen, but it's great that this discussion is happening at all. Maybe it'll encourage Gnome to improve their customizability, which seems to be the main advantage point of KDE