I want a movie that doesn't need a sequel.
The problem is the idea of sequels.
The alien films each stood on their own.
You go into it needing to do sequels, and suddenly you have characters you can't kill, places you can't go, stuff you can't show, ideas you can't explore fully, etc. You have to add just enough and leave everything hanging. That's a bad formula.
David's arc and the introduction of the alien should've been finished in Prometheus. Now it's stuck in limbo, and we've got several hours of "wing it". Scott should've gone all in on Prometheus. The budget and public interest was there.