I hate the Vikings as much as any TRUE Packer fan (not like these Favre following traitor f@gs who all of a sudden are big Vikings fans), but would hate to see the Vikes leave Minnesota.
My money is on the Jaguars. The Jags can't sell out a single home game it seems like and need to move. Florida is too saturated with the NFL, especially in a region where college ball is so big.
If the Vikes DID move...the NFC could have a different landscape. The St. Louis Rams, who are currently in the NFC West, would move into the North and the Vikings would take their spot in the NFC West. I'd hate to trade the Vikings for the Rams though.