I think it's a case of doing whatever is within your power to make your own luck. And of course next year could definitely be different so cancel whatever plans you have for posting "I was attacked for saying this last year but I told you the rotation wasn't going to be 100 percent healthy next year".
No plan on keeping pitchers healthy and effective is going to work 100% of the time. That certainly wasn't the case this year as Ryu was out for half the year, Manoah turned into a pile, Cimber got hurt, etc.