One problem is how to keep out competition like LEOs and other squatters seeing opportunity.
The other would be how to get through the door without destroying it - sure, you can go at it with an ax, but a destroyed door won't stop wild animals coming in.
But if those issues can be solved, I think it's viable.
This year's season of America is shaping up to have all sorts of plot twists. I wonder when writers will write an episode or two for the NATO plotline?