Without trying to be offensive, I often find myself mystified by customers who develop an almost religious faith in brands. "If The Company did it, it must be right." Why? Why recognize mistakes and press for improvements?
And who are these "customers who develop an almost religious faith in brands"?
Yes, I understand your point, but there are also a lot of others (not you) and a lot of threads already that basically come down to "I want a 5DIII at a 6D or a 70D price" or "I want a FF mirrorless with an EVF that servo AF that is as good as a 5D III for less than a 6D price), which is either not economically feasible for now or would lead to less total profit for Canon over the long term. And it is long term profits that matter because that is how R&D budgets get planned 3-5 years in advance. Canon is a stable company and there is a lot of value in that. I have a lot more faith in Canon being in the camera business 5 years from now than Sony.
FWIW, I started with with film with a Pentax but found their lens selection too limiting. My first digital camera was a Nikon. I preferred Nikon's flash system to Canon's (until the RT system), but I switched to Canon because of the 20D. I used a 5D II for everything, including sports and it worked (center point and crop). I don't think the 6D is as crippled as you are saying because the 6D's AF is still better than the 5D II's, especially the outer points. The 5D III solved almost all the things that I found deficient in the 5D II, and a lot of people did a lot of great photography with the 5D II.
The 5D II was an improvement on the 5D an the 5D III is an improvement on the 5D II. The cameras evolve, but as I stated before, they are evolving in response to the changing market. I am sure the that next wave of 1D/5D/6D will have a different set of features and differentiators as they do now, just as the 5D III had to improved AF-wise to accomodate the 6D. No one expected the AF of the 5D III to be that close to the 1DX's. The 6D has been designed and is selling. I thought it was smart move for Canon to design something that could go lower than the 1800-2000 that the 5D II was selling at near the end of its life, and I'm guessing that the 6D's price could fall even farther and Canon could still be profitable. Canon is doing better compared to its peers, which suggests it's getting more things right than not. You and I individually do not affect marketing and engineering decisions. Unfortunately, the design and feature set that will satisfy the most potential customers may still not be attractive to millions of other customers, of which you and I might be among. You and I might not like a company's decision, but that does not make the decision that the company made wrong.