It could be done, actually.
First Movie: Hal Jordan becomes a Green Lantern. Hector Hammond is infected by the yellow light of fear wielded by Parallax.
Second Movie: The Manhunters return seeking revenge against the Green Lantern Corps and the Star Sapphires are created by the Zamarons. The Massacre of Sector 666 and the Five Inversions led by Atrocitus appear, as well as John Stewart.
Third Movie: Sinestro creates the Sinestro Corps War and Parallax is freed to assist him to conquer the Universe. Hal and John are introduced to Guy Gardner and the prophecy. In the end, the Black Power Battery is created.
Fourth Movie: Atrocitus tames the red light of rage and creates the Red Lantern Corps to seek revenge against both the Green Lanterns and the Sinestro Corps. The Blue Lanterns are created by the now renegade Ganthet and Sayd to assist Hal, John, Guy and the newly introduced Kyle Rayner.
Fifth Movie: Larfleeze, the Agent Orange, is introduced, as well as the Indigo Tribe led by Indigo-1. All players are put in motion.
Sixth Movie: The Blackest Night arrives. Nekron, Scar and William Hand create a army of drone Black Lanterns whose power rings create illusions that force their victims to have emotional responses in order to destroy all life and light. Hal, Carol, Sinestro, Atrocitus, Larfleeze, Saint Walker and Indigo-1 have to join forces to destroy them.
But it would never happen.