There is no way there won't be another Twilight book and movie! Upcoming releases=upside surprise.
Even some second hand ghost written project would be another smash! I think the new slate of films are going to be gigantic hits too. They appeal to a very wide audience where Twilight does not IMO. Anyone think Hunger Games series isn't going to have box office of 1.5B minimum? I've been buying LGF recently, wish I could buy more. Look for a minority purchase investment from a rival, private equity, or a complete buyout in the future. The hits seem predictable now.
Compare Hunger Games domestic box office to ANY Twilight movie. LGF was very smart moving the Hunger Game sequels to the pre-Thanksgiving Day slot! I would be surprised if any of the sequels have less than 405M domestic box office. Don't forget DVD sales for each and every movie plus the eventual 4-movie box sets.