I don't get these threads.
First, that's never going to work. You play the guys the entire season for 30 minutes, and then all of a sudden come playoffs you ask them to do 10 extra minutes per game. the transition just doesn't work. The Spurs tried it last season and it didn't get them far.
Second, you want the starters on the floor because, frankly, they have to win you games, so the repetitive execution of game situations is vital. These guys get little time to practice together as it is.
Third, contrary to popular opinion, all our starters were well-rested come playoffs. Going down to 36 minutes per game represented a substantial playing time cut for all of them. Indeed, about 35 minutes per game is a good target, but I am strongly against cutting playing time for the sake of cutting playing time.
Oh, and by the way, the real way for young guys to learn is to put them on the floor with the veterans, not instead of the veterans. Which means cutting the playing time of guys like Tony Allen, and House, not Ray Allen or Pierce.