One of my best friends growing up, season ticket holder, was at the game and cheering because Schaub got injured...he was laughing at Schaub gimping off the field...I definitely know that there were more like him.
Hypothetical since Cushing and Watt've done a good job of legal tackling. Kareem hasn't and I see/hear nothing but curses shot his way when he launches himself or gets too physical. The only player football fans should be cheering for an injury is Cortland Finnegan. Maybe Suh.