This seems unenforceable to me. As others have said, players are nursing injuries and wear and tear as a matter of course. How can the league expect to police this, decide what is a legitimate injury related rest vs. general not allowed rest? Are they going to ask for notes from a doctor or some other silly thing? Define star player? Does that mean if we rest say Tristan Thompson that is OK but if we rest Kemba, we get fined? Or are you not allowed to rest anyone?
And what is going to happen when a player who might of rested gets injured in the nationally televised game? Or really does wear down and can't play in the playoffs? Is that better for the league?
I don't see this working well or really at all.