Caution.
Teams always don't just keep improving. Last year, my boss was trying to tell me the Lions were a shoo-in for the division championship and were all but guaranteed to get back to the NFC championship game and probably Super Bowl. I thought of Dan Marino and how people said he would be back and win a bunch of Super Bowls. It just is never that linear and simple. Players regress, injuries happen, and the other teams are trying to win too.
Plus, what are the Tigers going to do to add talent in the off season? When are they going to trade Skubal? Too many variables to predict success for a marginal team.