I had forgotten about that! What a timely reminder. I alwys thought that was incredibly difficult (Michelle did a one-foot sequence like that in her 1998 East of Eden exhibition program, too). To me, that kind of edge work is the heart and soul of figure skating.
But you get more CoP points if you hop from one foot to the other.
Difficult or not, I'm afraid I can't mourn the demise of Slutskaya's one-foot sequence. It was ugly. Very ugly. What I miss in the footwork are the fast footwork passes. Everyone now is trying to pack so much difficulty in that no-one, not even the best skaters, manage to fly across the ice as they once did. THAT was one of the things that made the footwork so exciting.