I agree! What a wonderful concept...Just an idea:
Canon releases a new mount for a medium format camera and that can accept also EF lenses via a simple adaptor or some tweak built in the camera. This new camera line will be the new 5D and 5Ds, the top of the line high megapixels and general purposes camera for pros. Obviously they need to release new medium format lenses so that you won't get a crop. This will be the perfect tool for studio and landscape work. It will basically be a GFX and X1D killer.
Besides that they release also a ff mirrorless line, one for pro sports, the new 1D line, a A9 killer but with a big grip, which accepts native EF lenses, the big primes that already exists. And also a entry level mirrorless camera, the new 6D line, aimed for street photography and travel, a A7iii killer.
I am so close to going with the GFX from my 6D and 20 year old Canon glass.
Waiting for Canon to give us a FF MILC has driven me crazy but my Leica Q has ruined me for mirrored cameras & it stopped me from buying the 5D-IV -- I want an EVF that is truly WYSIWYG. But I want the best image quality paired with a photographer's UI, not layers of menus.
The GFX provides all the pro features such as amazing image quality, dual cards, weatherproofing, real EVF, tilt LCD, both MF & 35mm modes, all with a photographer's user interface.
So I'm waiting for Canon's announcement. If the FF is for the pro (let's say a 5D-IV level), I stay Canon.
If the announcement is short on pro features, I shall order the GFX, Canon EF adapter, Fuji 110 f/2, and Fuji mid range zoom.