We are certainly going to need people who can live at a Stone Age level of existence because well, things are going to collapse anyway.

Now, as for a refuge if you just hide the enemy will not be impeded and we'll be considered trophy hunting. Have to make them react to us. Everything from nonviolent noncompliance to political takeovers of rural communities, temporary autonomous zones(go to John Robb's Global Guerillas for definition), to throwing bricks in windows to... basically engage the enemy with the full spectrum of resistance everywhere. And most importantly be successful.

Saying that, we need to get back to basics for awhile before we can build our own economy, infrastructure up and be Free.