The conversation around College Football Playoff expansion refuses to slow down, and ESPN's Kirk Herbstreit just added another voice to a debate that has split commissioners, coaches and fans for months. Appearing on The Pat McAfee Show on Tuesday, the longtime College GameDay analyst was asked whether he hated the idea of a bigger playoff field . His answer was less fiery than McAfee expected, but Herbstreit still laid out specific concerns about what an expanded bracket could do to the sport he has covered for nearly three decades. Where Herbstreit stands on 24 teams When McAfee assumed his co-host would push back hard on growing the playoff, Herbstreit pumped the brakes. "Kind of indifferent. Until you get experience with it, it's hard to hate it," Herbstreit said. He still raised real questions about what gets lost when the postseason swallows more of the calendar. "Would we lose the importance of Ohio State-Michigan, Alabama-Auburn, all those big (rivalry) games at the end?" he asked.…