Ubiquity is the word, I think.
And here's the feedback loop I mention so often: we expect things instantly, so game companies (though they are not alone in this) give it to us; we enjoy; we expect things instantly-er; we get it; we enjoy; we expect things instantly-er-er; we get it...
It's a vicious cycle, but it works.
One thing that I got to thinking about when I saw the "user experience" title was the recent "Augmented Reality" concept. The one I saw was called Layar (I know, this is soooo three months ago), but it really struck me as having a great deal of potential. It reminded me of Patricia Rowan's visual overlay in the Rifters trilogy. Now if only we can get a Bluetooth contact lens (which, according to the author of Maelstrom, has been around for over a year). I want! I want! I want!
Check out a video of Layar, the Augmented Reality phone app. Real-life HUD. Very cool.