My ideal dslr sensor would be a thin piece of plastic. There would be some sort of metal ion embedded in the surface of the plastic that would react when struck by light. The pixels would be placed at random, rather than a regular array, and would also vary in size, depending on the intensity of the light that struck them.
Instead of sending a copy of the array data to a storage device, the sensor itself could be fixed, say by dipping it in some sort of solution. As each sensor would be inexpensive to produce, you would keep one for every photograph you made. Then it could be reproduced any number of times, by many different means, and with an infinite possibilities of post-processing techniques.
Now that would be a sensor technology I could get behind!