look at operation cast lead a few rockets fired at an illegal blockade (a blockade being an act of war)and the idf went in, in force and smashed the place up.
do you think if there was another intifada that you would not have a bulldozer and tank smashing every house in the west bank, roads closed more walls less food prison camps and the likes, and if there was an actual war with iran they will use that as an excuse to push every last one out in to the desert possible Jordan, and definitely Lebanon.
thats why iran is playing i cool, because Israel beside nukes can not do all that much damage to iran or visa versa.
but when your in a total war situation thing will get very ugly very fast.
not to mention it only a couple of years till a republican is back in the presidency who will run on a "whats a Palestinian?" platform