Too steep for tubing? Really? When I was a boy at aspen, we would walk up the bottom part of little nell, (blue bump run on aspen mountain, considered "beginner" terrain in 1970) and sled down that on whatever was available, plastic lunch trays, boxes, those saucer things, a piece of plastic sheeting, whatever.
Now THAT was a steep "tubing" hill. Lots of kids got hurt, including me. I got going way too fast on a metal saucer, and didn't jump off in time, I crashed into a wooden ski rack and messed up my back. Still gives me trouble now and then....
I was friends with the owner's grandson back then -- he said they had more injuries from the tubes detaching (with people on them) being pulled up the hill than actually from tubing down the hill. One person would come loose, slide backwards, and then start knocking off other tubes and their passengers.
That and you'll notice the run headed right for the snow making pond, so they had to put a big banked turn and fence there.
Anyway, all that is left of that are the 2 tubing lifts.