There is more demand than supply for pretty much any sort of developers. Within your competition, it doesn't take much to be far enough ahead of the masses that

There is more demand than supply for pretty much any sort of developers. Within your competition, it doesn't take much to be far enough ahead of the masses that you will easily be able to get work. So, the market may appear saturated, but much of that competition is largely invisible. Also, not all app developers are freelancing, X percentage of those developers are working on their own thing with no interest in freelancing. Another very important item to keep in mind is that freelancing is running a business, and business management (and all the things that go with it) is not easy. Of all the X developers out there, a substantial proportion of them either can't run a business or shouldn't be trying (these people are the types who are leaving a trail of screwed clients everywhere they go.) So, if you can get ahead of the masses in your dev skills and get ahead of the masses in your business management skills, then you have nothing to worry about (except for thinking what could be possible by building your own apps.)