What the heck, I'll come out in favor of it. For one, seriously nominating Bono (or Carla) pretty much confirms to me that the position is useless. Second, either he will surprise me and do something good, or really mess up the world bank, and we can cut our participation in it.
I'm with you. I would be ecstatic if the World Bank could be undermined through the election of a nitwit rock star as its leader.