For the cost, size & weight of having an embedded bottom dual grip in every R1, imagine if Canon saved all that and instead put it towards a square sensor so that you did not have to rotate the camera anymore? They could size the square sensor to fit the existing image circle (ok, which I agree is not 100% ideal) for consumer cameras. They could also allow their top end R1 camera to take the full size FF shot in both orientations by designing a 36 x 36 mm chip in place of the 36 x 24 one. Yes it would be very expensive to do this (and we all know it won't happen) but it is something that could happen. You would get a better ergonomic R1 with a (probably) slightly smaller & lighter body (and more expensive initally). But imagine if they later came out with a few $$$ pro lenses to fit the larger 36 x 36 sensor image circle - That'd be awesome (and well, really expensive, but still awesome!). And some of their lenses are said to have an unusually large image circle so that they might even fit the larger image circle already!While I think the Alpha 1 specs are amazing I think Sony dropped the ball with the form factor. They should have enlarged the body so that it it could house two batteries like Canon and Nikon does. I just think it might be too much to ask someone to mate that small body onto a 600mm f4 lens and hand hold it. The ergonomics would be horrible. Yes you can buy the optional battery grip to complete the system, but I think forcing professionals to do that was a bad move. But we'll see I guess.
Canon WILL develop the R1 with a built in grip as per usual of their professional level bodies and use the extra space for cooling the video.