I only see the Brewers picking up on this even more next season, considering they'll have so many #5 starters, with a lot of other teams following behind. The tough part is how fickle middle relief is season to season, so it will probably be hard to see consistency on a yearly basis. But middle relievers are relatively cheap on the FA market (though getting worse considering what Colorado did), while at the same time starting pitching is so hard to find. I don't see it happening yet with big-budget teams, but I could see the mid-budget ones picking up on the trend. Would pitchers really dislike it? Hader could certainly be moved to more of a two-inning closer's role, and he'd be looking at $20M per if he were a FA. Though I have a hard time seeing a team do bullpen games with the entirety of their staff for reasons the Brewers are going to see at Los Angeles. Teams are playing six days in a row, or worse, the schedule the Cubs had in September. "That averages 160 innings per year" is great, but on a day-to-day basis, it'd be so easy to burn bullpen arms with a few tight games in a row playing six games per week. I think there would still be a need to have one or two traditional starters with a history of being able to go long into a game. But all in all, new trends tend to pick up on where the value is in free agency and developing players, and isn't that currently found with bullpen arms? Also, I bet Brooks Kieschnick is kicking himself that he showed up in the League 10 years too soon.