It's interesting to look at past junior players of the year (other nominees in brackets):
2008: Luke Braid
2009: Aaron Cruden (Winston Stanley, Carl Fearns, Richard Kingi)
2010: Julian Savea (Tyler Bleyendaal, Robbie Coleman, Ignacio Rodriguez Muedra)
2011: George Ford (Luke Whitelock, Sam Cane)
2012: Jan Serfontein (JJ Hanrahan, Shaun Adendorff)
2013: Sam Davies (Ardie Savea, Jack Clifford)
2014: Handre Pollard (Nathan Earle, Tevita Li, Garry Ringrose)
Obviously some of them might still make it, but out of that list - including the other nominees - only a few have kicked on to have any kind of impact at international level, namely Cruden, Savea, Ford, Cane, Serfontein and Pollard.