Urban Survival ?

It is one of those odd things as more people live in cities that anywhere else, and yet we city folk don't think on urban survival. They have plan to jet off somewhere in the wood, far away from we who stuck in the cities will become little but ravening monsters.
I'm of the opinion that cities can be made to function in the unlikely event that the nation truly collapses. Suburbs as well for that matter, What does anyone else think?
Peace,
David