Linkbait aside, if Apple's gross margin is decreasing, which it looks like it is, its most likely because of the iPad which carries a lower profit margin. So when iPad sales become a larger portion of total sales, gross margin goes down while total profits still go up.
Seems to me Apple will either just suck it up and deal with this, or will look to internalize their SOC production. Is this something that could have been possible with their PA Semi purchase?