I don't think you have to be a genius to predict that mobile app development is going through the roof! It does however take some amount of thought to predict the magnitude of the explosive growth, but on the other hand the study quoted here was commissioned by an app store so take these numbers with a grain of salt...
"A study done for Getjar, the world's second biggest app store, said the market will grow to $17.5bn (£12bn) in the next two years.
The study claimed downloads would climb from 7bn last year to 50bn by 2012 - a 92% year-on-year increase."
Big numbers!!!