Even after the gold rush is over, there’s still gold in the hills. It’s just harder to make a successful app that gets noticed, and requires teams with the specializations and experience to quickly and efficiently release one, the same way that the remaining gold requires geologists who know the land and heavy machinery to get to it.

And later in the same post:

Free with in-app purchase or subscription pricing looks more sustainable than paid apps. We may need to form ourselves into small teams, because being independent doesn’t mean you have to do everything yourself. I see this as a challenge to figure out what’s next.

I still think that In-App Purchases don’t work for some niches of the App Store, and I wouldn’t want to see developers switching to the IAP model in what may be a self-fulfilling prophecy. But with Apple leading by example, I believe we’ll see a lot of developers trying IAPs for productivity apps and utilities before next year’s WWDC.