How will the violence in Gaza end?

It is hard to see anything good coming out of this brutal civil war in Gaza right now. But Martin Indyk, US ambassador to Israel under Bill Clinton, sketches out a positive—and possible—end-game in the Washington Post today :

Whatever transpires, Gaza has become Hamas's problem. It's a safe bet that the real attitude of Abbas and Fatah is: Let Hamas try to rule Gaza, and good luck.
This turn of events would free Abbas to focus on the much more manageable West Bank, where he can depend on the Israel Defense Forces to suppress challenges from Hamas, and on Jordan and the United States to help rebuild his security forces. As chairman of the Palestine Liberation Organization and president of the Palestinian Authority, Abbas is empowered to negotiate with Israel over the disposition of the West Bank. Once he controls the territory, he could make a peace deal with Israel that establishes a Palestinian state with provisional borders in the West Bank and the Arab suburbs of East Jerusalem.
Meanwhile, Palestinians in Gaza could compare their fate under Hamas's rule with the fate of their West Bank cousins under Abbas -- which might then force Hamas to come to terms with Israel, making it eventually possible to reunite Gaza and the West Bank as one political entity living in peace with the Jewish state.