Rolando is well worth the price, I don't see it dropping anytime soon. Maybe on their next game release it'll go on sale to celebrate though, but I'd say pick it up now - it's well worth it.
According to Appshopper Rolando is ranked around 30-something in the top paid list and is slipping down each day. A price-drop could be in its future, definitely if it falls from the top 50...
It will sooner or later, NGMOCO produces excellent games all of which I have paid for as soon as it came out, Only to see a price drop only a few days or so later. While I don't mind, I think everything they make is worth the money, I am going to wait for Rolando to drop in price as well. It will happen sooner or later... Hopefully sooner than later as I have been wanting to try this one, just not sure if I will even like it that much...