That'd be amazing. I've seldom felt as immersed in a game – I loved the story and the atmosphere. The story of Marathon: Infinity was so mind-bogglingly complex that fans were still discussing and trying to figure it out ten years later. I don't believe there'll be another Marathon game though. However, the fans have done an amazing work keeping the story and universe alive through scenarios (mods/conversions, whatever you call them) such as Rubicon and Eternal.
Oh, and it's a shame Double Aught never managed to release it's game Duality.
Administration: An ingenious abstraction in politics, designed to receive the kicks and cuffs due to the premier or president. -- Ambrose Bierce