How rude.
Why is that rude? Quality in entertainment, i.e. movies, shows, theater etc. is subjective of course but the majority of Star Wars fans do not like the Disney trilogy and it also shows objectively at the box office, where each movie of the trilogy made less money at the box office than the previous one and the general consensus amongst critics and fans is not that favorable ( still profitable but not when you consider it has the Star Wars label on it).
So if a boss looks at the general situation and sees it is not working to expectations he will fire the person who is at the helm and replaces him/her - that's how companies work and have always worked, that's not rude. Either the Disney boss hires someone new in that regard or he takes a chance and promotes either Favreau or Filoni ( depending if they're interested) and make them head of Star Wars. They have proven themselves critically and financially ( especially Filoni, who's been doing Star Wars for longer than Favreau) so it may not be a bad choice.