Of course, what Canon really wants you to do is jump lines.
Canon obviously considers the image quality of their crop cameras to be good enough.
Hence, they don't seem to be making much effort to improve it.
For better image quality, you are indeed invited you to jump lines ... by spending more
Looking forward, I'm convinced that the 7DII will follow this pattern as well.
Unlike the 7D, the 7DII will use a different sensor than the rest of the crop models, IMO.
So, for better image quality in a crop camera, we'll all be invited to spend more on the 7DII - that is, to jump lines.