This is an interesting point. It's always been part of the negotiation that Israeli settlers won't be allowed to stay in what becomes Palestine, and yet it seems out of the question to expel Arabs from Israel.
which negotiations would those be? the only deal ever offered by israel was under barak's leadership and would have involved only the removal of a handful of settlers and there are now 100k more settlers living in palestinian territory then when that offer was made.
it seems out of the question to expel (more) arabs from israel because there's no equivalence to be made between people whose ancestors lived in the same villages for 100+ years and european and american colonists illegally transplanted onto land that belongs to someone else