I think some of you are missing the point. It is not about the cost of the upgrade, even if it is free. And it is not about your pc which works fine today and will not stop working because a new os is out.
The issue to be concerned about, and one we have seen with ios devices, is when Apple puts in a plist or kext file a restriction of a certain hardware type to prevent that hardware from running the new os, which is later proven to be a false barrier put in place along side new highly desirable os features which in turn entice people to upgrade hardware. That is planned obsolescence.
This is disturbingly true when people repeatedly prove the excluded hardware is more than capable of running the new os and new features. Or even worse when the market proves this and then Apple back tracks and makes it available later, ala gestures on the iPad one.
That is what, IMHO, worries me most about this new release cycle.