They could sell input devices along with their games. Most mobile devices aren't "touchscreen-only" devices. Android, for example, supports bluetooth and theref

They could sell input devices along with their games. Most mobile devices aren't "touchscreen-only" devices. Android, for example, supports bluetooth and therefore wiimotes as input with the proper IME app. Since Honeycomb, you can also use bluetooth and USB mice and other USB peripherals, such as PS3 controllers.