There are more Palestinians than Jews. They’ll be voted out of power if they are democratic. If they have a religious test they aren’t democratic. A one state democratic system will not yield Jewish power (unless they become more fruitful and multiply).
No there certainly is not. Especially not when Isarel has let Gaza go.
Not going to happen, since the Israeli birth rate is typical of that of most Western nations, because the women have mostly become infected by the disease known as feminism, which views birth of children as a burden instead of a duty and privilege. This will be the ultimate fate of the US, by the way, and no amount of border control will address this since the disease is already here, living in the hearts and minds of US women— it's too late to turn this around, really.