I just want to add that I think the series is in some serious danger. Not because PROMETHEUS 2 will not happen. Which is what evryone seems to think the major threat is here... But rather because with where PROMETHEUS left off, it is extremely easy for FOX to just make PROMETHEUS 2, a reboot of ALIEN that 'ALSO acts as a SEQUEL'
I'd pretty much rather see anything else than a ship investigating LV223 and taking off with a redesigned alien on board, and that is the easiest route to take. So, here's hoping anyone comes up with, or comes back to write something different.