The big unknown at this time is whether Canon will use the same sensor in the 7DII or not.
If the 7DII has the same sensor as the 70D, Canon will have a hard time, IMO, convincing people to spend more on the 7DII.
The 70D specs are quite good already, so why bother?
It would be a completely different story, though, if the 7DII has better image quality than the 70D.
So, it makes more sense for Canon to put a better sensor in the 7DII - but who knows what they will actually do.
I have long thought (and I have seen you post along the same lines) that the cost of the external AFE would drive Canon to integrate (or partner with a sensor vendor who does) but this hasn’t seemed to be the case. Their cameras seem to sell well despite somewhat poorer performance on the low ISO end. My gut feel is that the 5DIII is outselling the D800 (for example) despite the higher (MSRP) price and the lower base ISO performance.
I think that the bulk of camera buyers outside of guys like us that hang out on gear forums grousing over DxO results don’t pay much attention to the sensor details. Even I, having participated in these types of discussions for the last few years, bought a 5DIII. I did this with full knowledge of the test data and full understanding of the potential implications having seen Horshack’s demos, and the endless postings from Mikael and others. One of the main influences on my decision was the fact that I used the 5DII for several years and never found any IQ deficiency that wasn’t relatively easy to work around. My biggest complaint was the AF system which they fixed.
I still think that ultimately it will be the cost that makes them improve the sensors but apparently for now their cost model seems to be working. From an IQ perspective there really is no difference until you push it into the corner and most users never do that.