I think Giger is the man if they ever do an Alien Homeworld. He created the Alien and Spacejockeys after all. And his art is definetely unique.
The Spacejockeys?!?! Well homosapiens have been around 100,000 - 120,000 years??? Given the Spacejockey was fossilised.....500,000 years, 1,000,000 years?
I like the idea that they became bio-mechanical and eventually became sterile and died out. Preds then came along and picked up the pieces.
The Jockeys and Aliens seem related (through Giger's artwork) so I'd vote for Ridley Scott'a asumption that the Aliens were a bio-weapon of the Jockeys.
Certainly future films could have Jockeys in it, but leave them dead and fossilised and get Giger to do the artwork. Plus have you ever seen any of the fan-art of alive Jockeys?!? Look like Human-Elephants