This is something of a misnomer since while some of the settlements are recklessly deep into the West Bank - Ariel (above), for instance - others are indistinguishable parts of Jerusalem
. They are all, under international law, illegal. But some, regardless of legality, are going to stay. Even in the Middle East, common sense can play a role. The Jerusalem-area settlements are not going to be abandoned by Israel.
The settlements issue is complicated but not unsolvable.