Should College Football Have a Playoff System?

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I've been in favor of a playoff system for as long as I've been a college football fan. It just doesn't seem fair to a team that went undefeated to not have a chance at the number one ranking. So what do you guys thing? Should college football have a playoff system? And if so, how many teams should it be (I'm in favor of a March Madness-esque tournament)?