Given that the wall seems to work as a barrier to suicide bombers, the World Court has effectively attempted to impose the death penalty on a large number of random innocent Israeli civilians. Israel is unlikely to comply.

One advantage of being irrevocably labeled by most of the world as the epitome of evil is that you don’t have to debate whether the benefit (in terms of international opinion) of capitulation to such a ruling outweights the costs. There would be no benefit at all.