Jeffrey Goldberg, following Aaron Miller, accepts that settlements are not the main obstacle to peace between Israel and Palestine - that would be the Palestinian inability to deliver. Actually, I think even that evaluation is too glib: the main obstacle is the Palestinian refusal to accept a Jewish State.
I cannot tell you where they've been these past ten years, Miller and Goldberg. Most of us have known this ever since Ehud Barak offered to dismantle most of the settlements, (Camp David, 2000), and then Shlomo Ben-Ami offered to swap land for the remaining few square miles (Taba, January 2001), and the Palestinians turned them down. Then again, in the part of the world they live - Washington DC - most people don't know this even today, so I suppose we should be grateful for those who do, even if a bit belatedly.