Would William etc be daft enough to trust them not to load up more bile then flounce off again to have their books written for them? Would you want to have a conversation with someone with a direct line to Nutflix? Anything you say will be taken down, manipulated and used against you.
Were it all to implode in LaLa land then maybe he could return alone but she could never be trusted and I think that William is very sensitive to the public mood, her return would be a disaster for the monarchy.