Are true rivalries between sports teams a thing of the past? I have heard that all these multi-million dollar players are all friends nowadays because they go from team to team through free agency and they even get together in the off-season and workout together. They're all buddies regardless of the team they play for because there is no true loyalties anymore.

It seems that the rivalries are between the fans only. So it makes me wonder if newer expansion teams will ever develop strong rivalries over time or if they won't because the original rivalries that already exist were because the players started them and the fans were supportive.

Are true team rivalries dead and how does a new rivalry begin?