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A lot of the advanced stats are "normalized" for "reverting to the mean," but a hitter who hits the ball with authority a lot more often will "revert" to a different "mean" than the guy who is "merely" putting the ball in play.
It will take a long time for that kind of data to be collected at minor-league parks and made available, I suppose, but it ought to allow for a lot sharper focus on major-league guys at least.
Further, I can tell that Dr. K is in the physical sciences.  In the social sciences, you know you'll never have double-blind randomized experimental design (in most cases), so you take what you can.  If you can explain 80% of voting behavior by knowing how folks feel about the economy and whether they like the incumbent president, then you go with that.  Then you focus on what might shift along the margins (turnout, fundraising, gaffes, scandals, etc.).
I think we can do a good job of getting "profile" of a player from statistics, and then figure out what else to look at to see if he might buck the trend.
If someone thinks Carlos Peguero is a strong candidate to avoid what has happened to the vast majority of hitters with his profile, then we can debate that.  But with the stats we can "stipulate" to a lot of ground. 
Just my sense.