Further to my point. ESPN Top 25 fantasy prospects from 2013 still in the top 25: 10, and only 3 out of the top 100
Number of 2013 prospects in the top 100 2015 rankings: Rendon (BA #30, Now #21), Marte (actually un-ranked in 2013 #38 now), Springer (BA #37, #45 now), Hamilton (#20 BA, #60 now), Yelich BA #16, #77 now, Gerrit Cole BA#7, #78 now.
There are as many dead prospects from the top 10 of the 2013 list as there are current top 100 players (mind you Jose Fernandez is not listed in the 2015 top 100 because of his injury).