I agree with Simon. Cricket is the prime case study. When there are just rolling Ashes series, rolling one day series, pointless 2 game T20 series that end in a 1 all result, or the longer Big Bash series, the games don't have any consequence because there is always another chance to win in a few days time.
Football isn't in danger of going that far but there's a lack of intensity in either end of the home and away season. There's always time to recover from a bad start, so the first few games aren't played with the fervour of later games. And as it gets to the last games or so, when you are at the top, you are just waiting it out for the finals. When you're at the bottom, you don't care anyway. It becomes a competition for the middle teams.
I think less games would bring a touch more finals like attitude towards each game. Instead of a loss being a learning experience, it becomes a damaging blow to you season.