The Zionist ideology will probably never die. There are still Nazis today. Zionism will be a diseased ideology that will persist past our own lifetimes.
Political Zionism is Zionism pursued in the political realm by the state. I believe this tyrannical government will be dismantled both by the international community and by the citizens themselves.
The death of political Zionism occurs with the realization of the Palestinian state or with the realization of Palestinian rights within historic Palestine. After this war there will either be a Palestinian state with Gaza and the West Bank or it’ll be one state in which the Palestinians achieve full rights. In the latter they will take over the government as they will be the majority and realize their full sovereignty.
Palestinian sovereignty over any part of Palestine (especially all of it) is the defeat of political Zionism.