Apple is very likely to bring a less expensive iPhone to market to address some overseas markets where Android is dominant due to price.

And, while Apple may lose the advantage of having the most remunerative app market, there is still the fact that Apple takes home most of the profit in the industry as a whole, and will probably be able to increase both margins and profits while bringing a cheaper phone to market.

On top of all that, a rising tide is still lifting both Google and Apple, and there might even be buoyancy left over for some dinghy from Finland and a couple other OSs.

Any fundamental risk to Apple is years away, possibly so far away that it's past where some other major shift in the industry will happen.

And now that the Android SDK works with a IDEA-derived IDE, it's less painful to get up to speed coding for Android. Try it. You might like it.