I can't see this happening. I would love to be surprised, but they spent a lot of money constructing and installing those barges. They're not going to get rid of them after a couple of years barring absolute outrage by the majority of their customers (i.e. they are losing money because of them), and that hasn't happened. They might design a new show (although I don't think that will happen either; at most they'll just tweak Harmonious), but I would bet a lot of money that they're out there for at least a decade.