[Sylvanfan]

It seems that teams these days are lucky to have 3 pitchers stay healthy enough to throw 160 innings a year. So really...in terms of extending careers....it's probably only increasing the amount of time owners are paying pitchers to recover from their various injuries. Pick your 4 best guys and go with the 4 man rotation. You'll be able to carry an extra guy in the bullpen for spot starts, rainout double headers anyways. Plus a team like the Jays can still use the likes of Carlson or Downs to get right handed hitters out so it's not like they have a spot for a specialist who can only throw to one hitter a game type of thing.