I think we are going to start to see Apple pull more and more moves like this. They are basically where Microsoft was at their peak. Apple's share price is sky high, their growth and margins are phenomenal, and at this point to continue to deliver shareholder value, they need to grab money from more and more sources - that means squeezing their position for every possible dime. What's next after the iPad? What comes after the app store? Well, why not tighten up monetization of the app store by directly tying revenue with publishers.
I'm eager and a little weary of seeing Apple's next moves over the next couple years.