I remember when I saw the trailer at the cinema the first time, I said "Dead franchise walking!!!" to my GF. It was a joke, but not far from the truth. This movie was DOA from the beginning. No one wanted this movie. It was never going to be a smash hit on its best day. It's fate was only further cemented the day the mouse bought Fox.
No director's cut is going to materialize for this. Dark Phoenix will fade into the background of CBM history as an oddity. Disney wants us to forget it for the reboot, and audiences want to move on.