The increasing division between core and casual gamers actually makes a lot of sense, and fits well with Shamus' article about how the GPU (and the heavy hardware required to play games) is killing/changing the game industry.
All those grandparents and kiddies who have cheap PC's to check their email can't run Crysis, but Peggle does just fine.
In the words of Yahtzee "It all fits together quite nicely, like furious bloodstained sticklebricks."