Hamas was offered 1000 prisoners in exchange but they refused because Israel wouldn't let go terrorists who had actually murdered people as well. So this guy on his own won't be important enough to trade. Hamas will let him sit and rot till the end of his days rather than trade him and 1000 others for Gilad.
Police disperse hundreds in brawl in Kafr Manda, northern Israel (Haaretz)
from the article: 'Hamas weapons capability increased four-fold over last five years'