Think about this rationally: How much software do you actively use on your computer? I use perhaps 20 types of software. In total, I may have used 50 or 60 different software in my life.

In contrast, I have about 4000 songs. One conclusion that one could make from that is that the app market will stop growing at some point because people will have the software they need. Seems like the logical step.

But I'm in the app market, and the market is not what you think it us. People are not buying utilities, they are buying consumable software. For an example of what I mean, take a look at KreciDevs android apps: http://www.kreci.net/reports/android-developer-income-report...

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Those are consumable software and they are the most popular. WP Stats, what seems like more traditional software is the least popular.

And I'm not pulling these numbers out of my arse, I write such software also, and I have 40k downloads a day. FourSquare boasts about gaining 100k users in 2 weeks - I do that in 3 days.

I believe the nature of mobile software is fundamentally different from the nature of desktop software, and that growth could indeed follow the same curve as the music store.