This seems like a pretty flawed way to conduct business.
How does the odd man out, who isn't one of the hottest three, get back to being one of the hot ones? Depending on a manager to play the hottest three bats at any given time, seems a bit strange. This isn't taking into account past history vs a pitcher, L/R match-up, etc.
Yeah, this isn't a good strategy in general, much less realistic in today's game.