How about the next new camera having a replaceable sensor?
I've personally removed sensors from digital cameras - not that difficult.
Having a replaceable sensor, one could change the sensor like one changes a lenses. Imagine being able to have a high mp sensor for landscapes, and a medium mp sensor for fast sports/action, and a low mp sensor for low light!
Also, having the ability to replace the sensor when a new type of sensor became available would extend the useful life of your camera.