Is twilight breaking dawn the last book and movie?

Breaking Dawn will be the last book from Bella's point of view. Stephenie Meyer is currently writing Midnight Sun, which is Twilight except it is from Edward's point of view. She is also thinking about doing a different series that has the same theme and characters of Twilight, just not with Bella and Edward as the main characters. There is only one more book and it's from Edwards perspective of Twilight it's call Midnight Sun. Stephenie Meyer says she would love to write 20 more Twilight books only she can't. Why? I love twilight!! Blub!