Fans of mediocre teams have, from time immemorial, dreamed of trading all their high-priced talent for prospects, and then “giving the kids” a chance to show what they can do in the majors.  But this is better in theory than in practice, just ask the 1998 Marlins (54 wins) or 2003 Tigers (43 wins).  After losing 106 games in 2011, the Astros hired GM Jeff Luhnow, who promised to rely heavily on advanced metrics to rebuild the entire franchise, from the farm system out.