You're right. I would choose a kickass and healthy rotation over a kickass and healthy lineup simply because the former is harder to replace. But it's not like we need to go into next season expecting the injury bug to simply tradeoff. It would be unreasonable to expect several of our top starters to miss multiple months to injury. I don't expect all five starters to make 30 starts next year but I'm not expecting another extreme either.
I'm surprised by the start of this post from this poster, since you seem to be one of the more saber-oriented guys around here and WAR for pitchers and position players seem fairly similar. So, I'm curious what you mean by pitchers being harder to replace. Are you talking specifically about the 2013 Nats?