I wonder if there is any advantage in a type of digital Twin Lens Reflex camera?
Consumers would have to buy lenses in pairs.
Canon would love it if this concept ever got off the ground ... you'll be needing two EF 24-70mm f/2.8 blah Mark II lenses and two EF 600mm blah blah lenses. Instant doubling of sales. Whoohooo!
You wouldn't need to do pairs, a single lens much smaller than your current one would work for the frame & focus, and it could be a semi-superzoom with lots of AF points to cover a wide framing, but as you put on a longer lens, you'd end up with fewer points, but they'd cover the entire frame. Design it to cover the 18-200mm range, the wider frame wouldn't have as full a coverage, and the tele/supertele would literally have the AF points cover the entire frame, and able to track stuff coming in and out of the frame, so if I'm tracking a subject, and something crosses from outside the frame it ignores it.