It is impossible to exaggerate the importance of the death of the Hamas leader Yahya Sinwar. It creates the possibility not only of ending the Gaza war, returning Israeli hostages and bringing relief to the people of Gaza. It creates the possibility for the biggest step toward a two-state solution between Israelis and Palestinians since Oslo, as well as normalization between Israel and Saudi Arabia — which means pretty much the entire Muslim world.

It’s that big.

But, but, but.

The death of Sinwar alone is not the sufficient condition to end this Gaza war and put Israelis and Palestinians on a pathway to a better future. Yes, Sinwar and Hamas always rejected a two-state solution and were committed to the violent destruction of the Jewish state. No one paid a bigger price for that than the Palestinians of Gaza. But while his death was necessary for a next step to be possible, it was never going to be everything.

The sufficient condition is that Israel have a leader and a governing coalition ready to step up to the opportunity Sinwar’s death has created. To put it bluntly, can Prime Minister Benjamin Netanyahu of Israel live up to his Churchillian self-image and go along with something that he has previously rejected? That is the participation of a reformed West Bank Palestinian Authority in an international peacekeeping force that would take over Gaza in the place of the Sinwar-led Hamas.

For the last month or so, according to my U.S., Arab and Israeli diplomatic sources, Secretary of State Antony Blinken — at the direction of President Biden and Vice President Kamala Harris — along with Crown Prince Mohammed bin Salman of Saudi Arabia, Abdel Fattah el-Sisi of Egypt and Mohammed bin Zayed of the United Arab Emirates have been discussing ideas of what to do on the day after this war ends to rebuild a post-Hamas Gaza, pave the way for Saudi-Israeli normalization, and create the conditions for another attempt by Israel and the Palestinians to negotiate a different future in both Gaza and the West Bank.

The broad idea is for the Palestinian Authority president, Mahmoud Abbas, to agree to appoint the economist and former P.A. prime minister Salam Fayyad — or someone of his sterling reputation for incorruptibility — as the new Palestinian prime minister to lead a new technocratic cabinet and reform the Palestinian Authority, root out corruption and upgrade its governance and security forces.

Such a reformed Palestinian Authority would then formally ask for — and participate in — an international peacekeeping force that would include troops from the U.A.E., Egypt, possibly other Arab states and maybe even European nations. This force would be phased in to replace the Israeli military in Gaza. The Palestinian Authority would then be responsible for rebuilding Gaza with relief funds provided by Saudi Arabia, the U.A.E. and other Arab Gulf states, Europeans and most likely the U.S.