Very cool leaves.
Some varieties of satsuki do the leaf curl thing as part of their natural habit. I don't know if this is one of those varieties but it doesn't necessarily mean the plant is on it's way out. If you look under Azleas.org they describe some having downcurved leaf edges and some upcurved and some not curved. If their search was working you can even specify that characteristic in the search under the "leaf edge" tab.
Ian
巻葉 cultivar