Wrong.
This story is about desktop computers. My comments regarding margins mostly refer to computers, where Apple doesn't have a dominant market share, in a mature industry.
About the iPad and iPhone: that's a different story, but with similar conclusions. There, Apple holds a dominant market position. But remember, Apple just adjusted their sales forecasts of the iPhone 5C and cut their production due to lower demand than expected, proving that a marginally "cheaper" plastic iphone was an exercise in futility. Apple knows the top tier consumer smartphone market has already been skimmed, so they need a way to reach new/lower segments before Samsung/Android gets to them. Turns out the 5C didn't deliver. Keep in mind the market for smartphones has grown much faster than iPhone sales, hence Samsung's and other manufacturers success, while the iPhone remains as the premium product.
As Tim Cook once said - "all mobile phones are destined to be smartphones in the near future..." meaning even the poorest consumers around the world will have smartphones, just as they now have cheap (even disposable) plastic prepaid motorolas and nokias. Do you seriously see Apple catering to those consumers with their current brand strategy? And remember, for Apple it's not only about the hardware sales, but specially about the software and the media consumed through it.
Anyway, my point (again) is that, if Apple wants to appeal the desktop/laptop (and eventually tablet & smartphone) mass market, these cheaper versions with marginally higher prices are not going to cut it. Imagine they released a plastic MacMini or iMac for $100 less... the iPhone 5C is just a case in point. And in time, the same thing will be said of the iPhone and iPad - it's no as evident now, but it will happen unless Apple takes a different approach to its brand positioning and price strategy.
Perhaps Apple staying as a premium brand, with its products consumed by high-end consumers, may not be a bad thing after all for us current consumers, specially if the contrary would mean taking a hit in quality. Stockholders may want Apple to take over the world, but I don't want it to become the new Microsoft. Just think about it.
Cheers!