The (fantasy?) future:
DSLRs will have full frame 16Mp+ 35mm sensors BUT:
They will have an option to go into 1.5x DX lens compatible mode. In this mode only the cropped 1.5x image is captured and sent to memory card, thus speeding up write times and frame rates. Multi-pattern metering is also adjusted to take into account the smaller image circle.
So in the studio (or the Zoo), weddings, etc, you can use full frame CCD with your big heavy 35mm glass. In this case, the DSLR replaces the medium format camera.
But when you go out hiking, sports photography, you bring along your 500 f/2.8 DO DX IS VR USM AF-S superlight lens with camera set to '1.5x mode', since you don't really need medium format quality....
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