I'm not mad at anything.

Seriously though, everyone has answered the question of whether or not rivalries are dead but what bout my second question? With todays sports economics is it possible for new teams to develop rivalries such as the Yankees/Red Sox?

My feelings are that the rivalries that exist are only because they were started by the players long ago and the fans rallied behind their own players. When the players retire and the game moves on the fans don't forget and the rivalry continues. Without the players hating each other today how is it possible for new rivalries to being?