You have to admit the double headers was good for the fans, but bad for the players. You can't expect your catcher to be behing the plate for 14 or 16 innings a day for 10 straight weeks. I was in high school when they made the change, so I can't remember if both games were 7 innings or if the first game was 9 and the second game was 7 innings. Also, the wear on your bull pen having two games in one day could cause some problems. It's one thing to do it during regionals or the conference tournament, but the entire season could be pretty taxing.