They had better make defensive preparations for a siege. Food, water, guns, ammo, medical supplies, gas masks, night vision, body armor. Communications-satellite link, two way and ham radios, cameras. Fortify position with trenches, trip wires etc. Ambush zones. Escape route if possible.
It will all depend on the optics to save them. If the Federal thugs use real shock and awe overwhelming force, this will look bad especially if the Bundys’ can get their message out. I don’t think that the Leftist media and the government will get away with another Waco this time. The trust in government and the MSM is too low, and a large sector of the population intensely hates that Feds and MSM like never before.
My personal opinion is Obama would have to be absolutely out of his mind to allow this to go any further. Can you imagine the hell that would break loose if the feds killed somebody?