I like it! I like how this focus is highly kinesthetic, how it requires us to become very aware of our feet. I like too how it should help develop smooth, progressive movements, obviously originating in the feet.
It is obviously an "exercise," vs. "how to ski"--and I hope everyone understands the difference. But in the right situation, this is a great exercise.
Any concerns? Remember--ALL exercises have SOMETHING wrong with them--otherwise they would be "skiing." I would be a little cautious with this one because of its focus on only one foot at a time. And the way Lisamarie has described it, at least, its focus seems to be on the OUTSIDE foot--another potential "red flag." When we focus on edging movements that tip the outside leg, they tend sometimes to become static, limited by the interference of the inside leg. An INSIDE leg focus--rolling toward the little toe of the inside foot, rather than toward the BIG toe of outside foot--tends to produce continuous motion of the entire body (including the outside foot) into the turn.
None of these problems HAS to happen, though. They are just potential pitfalls to be aware of when playing with this exercise.