Does XDE run on Raspberry Pi? (Or if not, how difficult would it be to port?) It would be a nice hook to introduce people to programming if they could write mobile apps on the Pi.
If there are any problems, they would probably be easy to fix. The thing I'd be most worried about is just that some things might run very slow on the Pi.
The RPi hardware is pretty slow for a development machine. I have mine minimally overclocked but the CPU temperature was coming close to 85 °C and it took minutes for the starter project to initially load (after that, the build is cached). On the other hand if all you have is a Raspberry Pi, then Exponent is one of the few ways you can make iPhone apps.