After giving this much thought, I'm sure Canon has a wholly different strategy in mind. The next 7D will be the 7DD, the 7DoubleD.
The 7DoubleD will have two sensors, one an H and one a C. It will have two lens mounts, one for each sensor and a selector switch for which sensor/lens you want to use. The photography world will go nuts for this, hailing it as the greatest advance in photography since the autowinder. After seeing it, Nikon will simply give up and go out of business.
And finally, all 7DoubleD purchasers will get 70 virgin like creatures at their disposal when they finally depart this realm.