I don't think Cuban meant that football is losing interest right now; I believe he was talking about the future, with the league attempting to expand to 18 games, adding two teams to the playoffs, and developing a Thursday night package. He believes the NFL is overexposing itself, which is an ironic argument for someone who owns a team that plays 82 mostly meaningless games a year.
That being said, Harris Interactive asks people every year to name their single favorite sports. NFL (35%), MLB (14%), and college football (11%) are the top three, followed by auto racing (7%), NBA (6%), and hockey (5%). What's interesting is that the NFL seems to be getting more popular, while the NBA and college basketball have slowly gotten less so.
You can review the results for yourself here:
Harris Interactive: Harris Polls > As American as Mom, Apple Pie and Football?
Bookmarks