Raph Koster wrote what can only be termed a lament on his personal blog today, saying that "immersion does not make a lot of sense in a mobile, interruptable world."
Koster characterizes immersion as a style whose time has come and gone, and he concludes that games are no longer for dreamers due to their far-reaching popularity. "I mourn the gradual loss of deep immersion and the trappings of geekery that I love," Koster writes. "I see the ways in which the worlds I once dove into headlong have become incredibly expensive endeavors, movies-with-button-presses far more invested in telling me their story, rather than letting me tell my own."
Whether you agree with him or not, it's a sobering read coming from one of the chief creative forces behind Star Wars Galaxies and Ultima Online.