To go back up several messages ...

One of the drivers for Moore's law (possibly the main driver) does not apply for digital sensors. Much of the performance gain (and price drop) comes from continually shrinking the size of the chips. Shrinking chips for digital capture is not a good idea, as this inevitably increases noise levels (as does increasing the number of pixels for unit area). As a result I don't expect to see the same rate of improvement capability and price in digital equipment as has become normal in other areas of consumer electronics.