I doubt Arnold will do anything so couragous. JMHO. But these farmers already have the numbers behind and with them. They are a far, far larger population of individuals than the 1500 farming families in the Klamath Basin. They could organize and have thousands on hand.
Do that and turn the valves on with a huge crowd around. The Feds then move in to stop them. All the while the media is covering the growing scene.
Obama seems to cave when his actions are exposed to masses of Americans.
It might work.