Other than the NFL, the leagues and networks have become satisfied just bending over all the consumers. It's the flawed broadcast model in the US. Why get advertising to support these events when they can rape 80 million viewers nationwide for base package subscriber fees, when probably only 30 million actually watch the channel at any time throughout the year. The video providers know this and aren't going to let CBS or NBC get their sports channels into basic packages, so I don't see espn losing the rights because CBS,NBC and Fox are locked out of being able to fund a bid to the level that espn can.
This is why the NFL is so popular. It has remained on the broadcast networks. You've seen ratings and popularity declines for MLB, NHL, Nascar, PGA, etc.. since they moved the majority of their broadcasts to cable. The NCAAF regular season still has a lot of games on the broadcast nets each week, but the bowls have all moved to cable and viewership/popularity of those games have declined with that move. Until they price themselves out of the market, live attendance has remained up, but I can see that starting to decline in a few years just like NFL live attendance.