+1 that is a real good summary. not many appreciate that with the higher pixel density there are greater demands on the resolving power of the lens, which will also approach its diffraction-limit at a wider aperture.
the interesting tests are yet to come, i.e. new generation APS-C sensor (presumedly) compared to cropped images from 5D3, for example. and then the leap frog games begin, i.e. the 7D2 will live for another 4 years, during which time the 5D4 will emerge and make a new challenge to the high density sensors.