What’s Next for Foursquare? Monopoly?

Since Starbucks and Foursquare have teamed up for a recent promotion, mayorship now has more than a virtual significance.  When’s Foursquare going to allow the “trading” of mayorships?  Say you want to be mayor of a Starbucks, and I want to be mayor of a McDonalds.  As mayors of these respective locations, can we trade these virtual properties?  Kinda reminds me of the game Monopoly…