James Cameron Says if Avatar: Fire and Ash Doesn't Make Enough Money to Justify Avatar 4 and 5, He's Ready to Walk Away and Write a Book to Resolve the One Thread It Leaves Open

What happens if Avatar: Fire and Ash doesnt make enough profit to convince Disney to bankroll Avatar 4 and 5? Creator James Cameron has said hes ready to walk away from the franchise, adding hell write a book to resolve the one thread Avatar 3 leaves open.