If the main action heroes were a couple of women (either of which could be Luke and Leia's mother) and the Anakin/Vader character is a minor unnamed character until he becomes Darth Vader who spends most of his screen time fighting the Jedi and not being one.
If Tarkin was a respectable military leader who has good reasons for backing the Emperor and becoming the cruel Grand Moff we see in ANH.
Such a trilogy would augment the existing films and be dramatic movies in their own right.
The existing PT is parasitic in it's relationship with the OT as apposed to balanced and dramatically unique.
Finding out that Threepio is Luke's brother was migraine inducing.