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And re-reading my comment about not getting smarter ... I can understand the misunderstanding.
I was, in fact, intending to compliment the intelligence of the prospect watchers, not impune it.  As ghost noted, the prospect watchers haven't had anything to predict, because there has been so little change in the many prospects that have flooded through the system.
My note on 'predictive' ability is not meant to suggest that prospect watchers can easily peg the next guy to morph into something better.  But, Doc has noted in various pieces over the years, (and I've seen it stated elsewhere), a science only becomes a "hard" science, when it becomes predictive.  Mendeleev wasn't brilliant for simply creating the periodic table of charts -- he turned chemistry into a PREDICTIVE science by supplying additional elements that had not been discovered at the time AND stating what their properties would be.
SABRmetrics are too tied up in human chaos to likely ever become a completely "hard" science.  But, I think it's the understood goal of most scientists that they are in search of predictive theories -- be it what the properties of gallium may be or the effect of load and stresses on static structures. 
My intended implication was -- "they aren't getting smarter, because they've always been brilliant" -- but they've not had an opportunity to actually follow "developing" players for most of a decade.  I just did a lousy job of communicating that.