BMD are doing it for way more than 10 seconds at 4k with a camera that costs not much more, so obviously it wouldn't be impossible, would it?
At this day and age I don't see why a 7D2 couldn't shoot 2k raw for constant video if that's what Canon decided to, not just 10 seconds, hell the BMD pocket camera does it for half the price, so why the skepticism?
Asking for a 1 second raw burst, or even a 10 second raw burst, is thinking extremely small, if you're gonna wish, wish big, we don't want canon or anyone else thinking that's all we wish for, do we?