This cracked me up for some reason:
Dunn has a theory about why they are The Collapsible Cubs."Every year they fold at the end, every year," he said. "Why? I believe they get tired. It's all those day games they have to play. It's like spring training. Players like to sleep in, but they can't do it here. That takes its toll."
That's as good an explanation for why the Cubs suck as I've ever heard.