Sometimes, the worst thing that can happen to a director is success. Look at Soderbergh -- he maintained his integrity up until Oceans 11, and now he's doing Oceans 12. With School of Rock grossing 100 million, Linklater is now in the big leagues, and he needs to be careful. Doing a remake of Bad News Bears is one move closer to joining the dark side. School of Rock was a decent, entertaining film, but it certainly wasn't the work of an auteur. It has all the earmarks of a Scott Rudin production, in which everything is slick and upbeat and geared for a large mainstream audience.
A cautionary tale is Demme's career -- he was one of the most unique filmmakers in Hollywood until Silence of the Lambs, and now he squanders his talent on uninspired genre pieces.