Now, that's an interesting point. Can a new owner have total ability to declare something non-canon? I would declare Kelvin-verse non-canon, in a second, but it's an official production.
When Disney bought Star Wars, they declared the Expanded Universe to be non-canon, which made those novels fan fiction. But I don't know if even Disney can declare A New Hope non-canon.
Not entirely sure why anyone would care to be honest.