There will be no train wreck. They will confiscate the cattle. The people will protest vigorously. When the cattle have been confiscated, the BLM will leave quietly. The federal government will have demonstrated that it is invincible at the local level. People who adore power and control will become even more in love with the government.
The only train wreck will result from a violent action by a rancher or militia visitor. Then there will be a massacre, and the last two sentences of my first paragraph will still hold. That’s how it worked in Waco.
That's exactly what will happen... pretty simple.
I sense there will be a short lived range war!