At one point early in the conflict, I seem to remember that almost everyone on the Forum agreed that Israel should be a secular, democratic state with equal rights for Jews, Christians, and Arabs. What struck me at that time was, that is exactly the demand of those who cry "Palestine shall be free, from the river to the sea", except that the name of the state would be 'Palestine' instead of 'Israel'. In such a state, the 7 million Jews would live there. No one, to my knowledge, has called for an Arab ethnostate.
I don’t think such a state would be a stable polity even if October 7 hadn’t happened. The closest precedent is the Bosnian federation and that only works as a decrepit two-state federation kept alive on foreign aid and mass emigration. Israel started down the path of strict separation and walls because of constant violence from Palestinians. The existence of Hamas, “we don’t want no two-state, we want all 48” demonstrates a good chunk of Palestinians wouldn’t be satisfied sharing a state with an equal Jewish population so we could reasonably expect more armed resistance. And I won’t pretend Israeli Jews would be much more accommodating! The whole thing is a fantasy.