Presumably, Netanyahu has a little more inside information than the Yesha Council of Settlers or Moshe Arens, so they are in no position to sit in judgement upon Netanyahu's actions. One thing we know. Netanyahu, like Sharon before him is a life long enemy to the Palestinians. If they do something which appears to be appeasement, you can bet that there is more to it than meets the eye. My guess is that Obama would suspend support to Israel if he does not get his way here. There would be a major political skirmish with the congress, but the congress cannot defend giving so much aid to Israel at the same time they are slashing aid to Americnas. This is a battle that Israel doesn't want to see. Not now at least. This is the only thing that could cause Netanyahu to "panic" in this way. If this is the scenario, and I believe it is, Netanyahu has good cause to panic.
Iraqi car bomb death toll rises to 25 (Reuters)
from the article: Settler council: Netanyahu's West Bank pullout plan radiates panic