Some Israelis are living in the land of their grandfathers but most of them have countries of origin they can be returned to. If that would be bad for them, there’s always countries they can emigrate to. But most solutions that aren’t zionist or “two state” are along the lines of “abolish the ethnostate and replace it with a real democracy” in which case the people currently living in Israel (minus those guilty of crimes against humanity) largely go about their lives as they did before.