Very true that the lifecycle of an app can be very short due to the need for the app store economy to constantly unleash new blood. However, couldn't he have used his momentum to build a base of loyal users to help his future apps, rather than (as the article tends to suggest)(, start from the beginning again each time.
The successful app, should have yielded him a customer base of which would make it easier to seed a new app, rather than fstarting again from zero? More interestingly, more analysis into the cost benefits of when to do further updates, and when to release a newer version would be insightful.