A fair whack of Israeli settlers can be expected to voluntarily move behind the green line if and when the generous subisdies are withdrawn. Those that remain will be Jewish citizens of a Palestinian state subject to its laws but no special privileges. Given that the settlers have been somewhat pampered by Israel, it may be too difficult for them to adjust - why would most want or be able to stay.
10 arrested at Israeli Arab protest in Ramle (Haaretz)
from the article: Israel going for one million Jews in the West Bank