Re: "The fall of Angry Birds", this article should be titled "The fall of paid games, the rise of IAPs".
Angry Birds, as a franchise, is doing anything but falling. Just look around the next time you go to a Walmart or Target. Angry Birds lunch boxes. Angry Birds Halloween costumes. And yes, Angry Birds Cheese Nips[1], which my kids are consuming even as we speak.
And it's only inevitable that Rovio is or will be working on an Angry Birds game that takes advantage of IAPs over an up front charge.
[1]http://www.walmart.com/ip/Nabisco-Cheese-Nips-Angry-Birds-Ch...