These are all great comments - clearly there is a large number of people here who prefer having a physical game in their hands as opposed to an on-line subscription service.
Let's not forget that we're commenting on shadows and fog - we have very few hard facts about the game so far, and we should reserve our judgement until we see some actual details about the structure and gameplay.
Personally, I'm open to the idea, but they need to sort out this immersion vs. interaction problem. While we all want games to be immersive (who doesn't), we don't necessarily want to interact with other players in real-time particularly those whose purpose is to decrease out enjoyment of the game.
I hope Cyan carefully considers these points.