That is true, assuming Gaza can be considered to be under Israeli control. But that is the political logic. I was talking more of the legal logic under international law. Under international law, Zionism doesn’t enter into it, there is just a state called Israel and that state would expand by annexing territories it conquered in a war. The demographic aspect, i.e. whether it’s majority Jewish or Arab, wouldn’t really matter. Of course, in international relations and in this case in particular, the political logic has always mattered more.
My worry however, is that Israel will annex the West Bank in its entirety once it feels demographically secure enough to do so (given fallen Palestinian fertility rates and stable Jewish ones coupled with the relative emigration rates, that is not implausible in a decade or two). It is relatively easy for Israel to rid itself of any legal responsibility for Gaza by giving up the control it has now, and the Palestinians will be left with a small city-state. The logic of saying that Palestinians under occupation should have the right to vote in Israel might down the road play into Israel’s hands.
That is my prediction for what will happen eventually (but not my hope)