Maybe /maybe not.
FF lenses are really going to put to the test with this sort of resolution and like the Nikon1 system or the PentaxQ, the lenses arent able to be stopped down much because diffraction becomes very intrusive. Optics still have a way to go, but in the end, physics will still win out.
In the not too distant future they will easily be able to exceed what lenses can do so I think they will look at other means to increase resolution like developing a sensor that is sensitive to colours.
In the meantime, the D800 will be a nice bit of kit, along with the D4 or the 1dx, it just requires some cash.