You are assuming Canon will leave the 7D II in the same target demographic bucket as the 7D.
This is a safe assumption to make, IMO.
To put it another way: if the 7DII is the 1DIV successor, what will be the 7D successor?
This is a rhetorical question
Like I said, I don't see the 7DII morphing into a different class of camera.
I'd point to the various statements Canon has made about how they want to do something "special" with the 7D II.
What Canon actually said was that the 7DII would "evolve into new territory".
There are different ways to interpret that but I wouldn't read too much into it.
Just consider that when the 5DII was announced, its video feature was considered 'revolutionary'.
So, now that Canon is talking 'evolution', I wouldn't hold my breath for a big departure from the current concept.