The data in the article doesn't really show anything people didn't already know. There's no surprise that the download rate of the top 20 apps will eventually decline. I mean, look at their saturation amongst users, it's still ridiculous.

What's interesting is going to be the new subscription model incentive that gives publishers an extra 15% for subscription retention after the first year. Don't forget, App Store 2.0 is just around the corner and it could change the game. Not saying that it will, but it could.