But if you need coverage with certain lenses, FF is a huge step forward. I personally don't need 10 fps at FF, but at 1.3 for news and sport that speed would be very useful. The dynamic crop would give you a choice of FF with lots of MPs and around 5 fps, or dynamically cropped to 1.3 you could have around 10 fps. That's what I'm saying, you would have two cameras in one. Everyone would be a winner - except Canon, so I'm not sure they'll do it.
not every high end camera needs to be FF, Canon already has provided 3 to date. Most of us are happy with 1.3x and perhaps wouldn't buy it if it were FF