The problem is this: you can be made to lose everything by the simple expedient of forcing you off that ground. That's always the danger of squatting i.e. the moment you are ejected then your "facts" are gone, and at that precise moment you realize that you have no "rights" that you can fall back on.
UN: Gaza could be 'uninhabitable' by 2020 if trends continue (AP)
from the article: Knesset report slams Israel's preparations for Palestinian statehood bid