Planned obsolescence? Fine with me. They still support all these products for several years after the truly serviceable lifespan. In fact, I admire the pace at which they retire older hardware, unlike the PC world where it lingers like some festering disease. I have yet to hear one compelling reason why Windows 8 needs a 32bit version, yet it will have one. I can still install OSX 10.7 on systems that are over 5 years old... As we reach the 6+ year old mark, we're limited to OSX 10.6 Snow Leopard at this point. Got to draw the line somewhere and I think Apple has done a good job. Sure, there's the comments to the above article where someone is complaining about the Intel platform shift and how his cube was left behind. Whatever... The cube was a novel idea, but it was never a powerful system to begin with and by todays standards it can't even cope with moderate web content, so what matters? I have a 6 year old Mac Mini that runs circles around a cube and I haven't been able to give that away. The kids won't even play with it because it's not powerful enough to run simple games they download for free off the app store.
I view Apple's "walled garden" and mostly closed ecosystem as a hinderance at times. But their planned obsolescence and forced progression has proven to be a good thing since Jobs pushed in that direction. I hope that aspect of it continues and I think the PC world could learn a thing or two here. I know others will disagree.