I'm not buying it.
1) Canon has invested millions of dollars in the technology behind the 7D series. It' very
unlike a Japanese company to go bonkers and leave all that technology without current representation.
2) There is no substitute for the OVF...yet. Most 7D users are very picky on this subject.
A move like this would alienate a good number of hardcore Canon customers with a ton of EF
lenses that work superbly with a traditional OVF, not an EVF.
3) It would eliminate the natural upgrade path to the 5D series.
Both bodies are very much alike. The feel like a brick. Buttons are almost in the same place.
In fact, it's not rare to see photographers and photojournalists out in the wild with a 5D in one hand
and a 7D on a shoulder sling.
4) The market is small, but it's still there. Nikon's D500 should be the mark to beat, not your own 1DX.
Arguably, Nikon's model is one of the better camera's they've released in the last decade.
5) Mirror slap. Canon included a new mirror box module with the 7DM2 to
make it tougher and less prone to mirror slap. Where is the added space in the cheaper
XXD line for this feature? There's a reason the 7D is so heavy and so firmly built.
The 80D, which is nice, is not in the same ergonomic league. For speed demons, like birders, this is crucial.
If I were to place a bet, I would put $ on the 6D M2 being the last of its kind, not the 7D M2.
With the prior model, you have everything and more in the mirrorless option, but not with the APS-C model.
In that sense, and in many others, the 7D is unique.