I would of loved an Empire style ending. I would of left Prime dead after the forest scene, made Jetfire destroy the sun weapon and Megatron, have The Fallen and Starscream maybe kidnap Sam or Mikaela and left everyone wanting more. That way Bay has to make a third film. Then in the third film i would bring in Unicron, resurrect Megs as Galvatron, bring in Rodimus, Ultra Magnus, etc, rescue Sam, then combine Jetfire and Prime. All out battle on Earth and space.