Lets face it, mobile is the way forward and I feel as a developer that is the way to go. Instead of App development, I am considering offering some kind of service to mobile developers and users. People say build solutions not ideas, can you guys think of current problems with mobile? :)
Privacy laws are pretty lax in the US but in Europe, Canada and much of Asia the story is different.
A service that can handle "privacy" would be very valuable and would probable get support from regulatory agencies around the world.
Most products are build for the web and then ported to mobile. I believe to be successful on mobile you have to think mobile first. Example: Web forms and surveys. There are services like Wufoo that build a great web product, but on mobile it sucks. We have a mobile app and close to all our users use this as their only computer. There is no service for great forms that we just can use.
This is the case for many other products.
These are my thought beside the typical mobile apps. Think of existing services, but think mobile first!
Distribution
Data Sharing
Privacy
Offloading to the GPU
Encryption
UI/UX when delivering across differing platforms natively
Localisation, especially when you involve bi directional languages