Resources are limited! R&D resources, too.
For ... how many years? ... (some) people complained about DSLR being a dead horse and Canon should do like Sony does.
Now, as Canon does, the DSLR people (I am one of those wanting a 5D5) come and tell the other way around. And they have said that in the past, too.
As stated above by
Valvebounce Canon is not making decisions based on a gear head forum like this but on market researches.
And if Canon is making a move like we see throughout the last year (EOS R/RP, RF) I think it is not likely to believe that what you've demanded above will ever come.
But Nikon is turning into the same direction - with presumably even less resources.
And even it you mention the D6 it is also said here that a 1DX3 is around the corner, so...
Nikon has some better Nikkors here Canon some better EF there, but I don't see both them with big old lens system releases in the near future - if ever again.
So where do you think you should turn to, if Canon is not reacting immediately on your post here?
And much more important:
Where is the current gear available really limiting you that much, that you need, that you urge to change brand if Canon is not delivering exactly that one peace of equipment that fulfills your individual requirement specification?
Or is this yet another
and "the grass is always greener..." rant?