The core concept of this article is solid - build something useful. That's how I'm getting triple digit year on year growth & traction with my app, http://www.getcampusmaps.com . Students find the app easier to use than going to the visitors center and getting a paper map, and so it provides real value to them.

I disagree that the app store gold rush is completely over however - I entered a crowded space with established competitors (including each school's own app, Google Maps, Apple Maps, GuideBook, Blackboard, and many more, and am still able to carve out a solid niche for myself.

The trick is in not only providing value with the app, but having a scalable marketing strategy. Treat it like any other product you want to sell, don't ride the Appstore-luck wave.