There are currently 500000 egyptian tropps at border in rafah to prevent palestinian refugees from coming in. Egypt cannot afford to hiuse these refugees. Its got enough domestic problems of their own. But those troops, seeing their own arab brothers massacred, may take matters in their own hands.
If that happens, the hizbollah will go all out from the north. And west bank from inside will erupt. Jordan with a majority palestinian refugee nation, will probably be forced to join in. It will be a blood bath.