What I like about the explicit rotation: * more transparency, the rotation is no longer an unwritten rule; * more time (2 years) to make Wikimania great, less volunteer time spent on (concurring) bids; * more concreteness and (hopefully) cooperation in the selection stage, less "let's beat continent X"; * more pragmatism, recognising we can't always flight the biggest groups of people in the farthest places.
Nemo