I do not believe that Israel will allow anything to get into Gaza through Israel, whether building materials, gas, or electricity, for quite a long time. Gaza will be left a wasteland long after the war ends. The naivete has been erased on Oct 7, 2023.
Israel must tighten the blockade and make sure it has inspectors at the Rafah crossing from Egypt. Gaza will be a living hxell for the survivors. The lesson delivered by Israel must reverberate in Beirut , Damascus and Tehran