"Will Smith is making fun of blind people?! Outrage!!!" Hold up. Yes, technically his sketch with Jimmy Kimmel is a little on the poor taste side, but it's not nearly as offensive as After Earth. Zing!
Sports movies are generally about underdogs and perservering in rough times 99.9% of the time - Coach Carter, Rudy, We Are Marshall, you get the idea. Since refs are so often accused of being "blind" all the time anyways, why not do a movie about a blind ref?