If Scott can keep his ego in check (unlikely) and shows some humility then a 3rd movie done with someone like Fede could be really good. He could tie it in with romulus and the greater alien universe.
Scott did not create the alien universe, dan o bannon and Ronald shusett did. He directed alien but had no real input into the story. It is one of the greatest movies of all time and for those who have never seen it, it is an incredible suspenseful film. You just don't know where the alien will strike which is why isolation was so good. It played to the strengths of that film.
I don't mind the idea that david created a strain of xenomorph
I absolutely hate the idea he created the race. I think the signs are there that he didn't. The derelict is there 1000 of years and the mural of the queen in prometheus.