Since Nikon is currently producing lenses without built-in AF motors (eg. 105mm f/2D DC, 135mm f/2D DC, 180mm f/2.8D, 80-400mm f/4.5-5.6D, etc....) I think that AF motors will continue to be included in the Prosumer and Pro bodies for at least the next few generations of bodies. I would suspect that when the time comes, the Prosumer bodies will lose the built in AF motor a few generations before the Pro bodies. Remember that Nikon has been very good about maintaining backward compatibility. Good Luck and Enjoy your Nikons!