They keep using that word. I don't think it means what they think it means. And neither do the writers of an op-ed just published on Ynet:
Martin van Crevald, arguably Israel’s most prominent military historian and strategist, laid out a compelling case that illustrated the negligible effects of giving up the West Bank. In his analysis, he states: “It is crystal clear that Israel can easily afford to give up the West Bank…strategically speaking, the risk of doing so is negligible.”
Our borders proved to be perfectly defensible in the 1967 war against our Arab neighbors, even serving as a starting point for an expansion into the Sinai, Golan Heights and the West Bank, all of which were retained by Israel in the outcome of the war.