I've noticed a growing number of operating systems available for anyone downloading an application; particularly in the mobile computers and cell phones. This means the OS is becoming more hardware specific and a new layer is forming above the OS. This layer seems to be the browser (see Firefox plans, Google OS for 2010, etc.).
The OS isn’t going away anytime soon, but its role is being nibbled at slowly but surely. I’m sure that Microsoft, Apple and the folks behind the various flavors of Linux would beg to differ. But the writing is on the wall: While people are focused on winners and losers in the OS wars the reality may be that they all lose.