I'm with True Blue Brew Crew on this one. It's not rigid, and it's not the entire rotation, and it's not meant to supplant or eliminate pitchers who can throw 110 pitches and get through 7+ innings. Aces will still be aces--and even guys who are not aces but are cruising through the 5th, 6th and 7th innings will be allowed to do so. Using more traditional terminology, all it is doing is adding a couple more long relievers to the bullpen and having a slightly quicker hook for starting pitchers. There is a psychology that goes along with these traditional roles and terminologies that is not helpful to anybody. Definitively calling somebody a "long reliever" rather than a "starter" generally has negative connotations associated with it. There are a lot of guys in this category--who are good enough to pitch 3-5 innings very effectively but not quite good enough to consistently pitch 6-7 innings consistently. If you get 3 consistent starters who CAN consistently get to the 7th inning, great--do that. However, if you can then get 5 other guys who are more in the 3-5 inning category, then you use them that way, and you still have 5 spots left on the pitching staff for traditional 1+ inning late game relievers (or high leverage middle game relievers). It's not rigid though in that if one of your better starters has to get pulled in the 4th, so be it, and if one of your 3-5 inning guys is cruising into the 7th, let him cruise.