In any event, Scott has mentioned many times that he's intent upon continuing that story, and apparently in a recent Empire Magazine interview with the revered director he's let it slip that, indeed, Prometheus 2 is soon to be on-the-way.
Minimally, I'll look forward to it. Having watched it again on home video not all that long ago, I found a greater measure of appreciation for it. It doesn't approach Scott's genius in handling other motion pictures, but it's definitely a worthwhile excursion deep into the realm of SciFi ... and, for that, I'm always thankful.