mobile apps are very popular, so which mobile would people choose?
At this stage, it seems that iPhone is more popular than android mobile.

However, apple is doing something which is not good to user and developer.
developer
- the annual fee is too high, US $99/year. Sorry, it is not only US $99/year, but you have to invest and purchase a MAC machine. Last but no least, you still share part of our development profit, apple earns a lot for those who want to develop apps and that’s why the apps price is so high.

user
- new iPhone always want to launch on time. However, is testing enough? Do you know what happen on 4GS? And recent news tell us that they plan to change the adapter for iPhone5???? if they really do so, i guess some users will switch to android mobile few years later.

At this stage, market still demand for iPhone and Android apps developer.
However, just like nokia, motorola such big brand, maybe after 10+ years, mobile industry will have new products and new brand replacement again, developers have to study the new API one again..