As much as I have apathy for George Lucas's creative decisions, I respect his business savvy, and thats what the classiest of fiction directors such as Cameron, Fincher, Mctiernan and Scott are missing for the most part.
The best possible solution to keeping a saga fresh is for the creators to OWN their works. No studio interference, no playing the slots on directors and writers, no middle man, the owner of the franchise chooses who can make what. Perhaps we wouldnt be having as much problems with the saga in this situation.
For the Predator franchise, who owns that? What happened with Alien 1 and Ridley Scott? And how does fox end up owning BOTH franchises to this day? Its just WRONG.