At risk of taking this off topic, my biggest thing is why do we still have starting pitchers in baseball? Pitchers should still pitch the same number of innings in a year, but spread them over less innings per game in more games. There are so many benefits:
-You can maximize lefty/lefty righty/righty matchups.
-Your weaker pitchers can pitch against the bottom of their order.
-The batters only see a pitcher once per game and never will time them up the 2nd or 3rd time around or recognize their tips.
-Your never leave a guy in too long.
-You should be able to manage and prevent injuries.
I know some teams like TB do dabble with this sort of thing sometimes, but try telling a Verlander that he's not a true starting pitcher anymore.
I believe a team could win 10-20 extra games a year if they adopted this full-time. Won't happen though.