This is where you have it wrong.
Country folk have zero desire to "Take over" places like Shitcago, Seattle or NYC.
The goal would be to keep the residents within the city limits.
The fun would be in shutting down their food, water, electricity and sewage.
That wouldn't be difficult
I use to live in the suburbs of Seattle. Thank God I've since moved. But the way I see it. Rats are going to scatter. The first wave will be able to sustain the flight, the last wave will probably starveby the time they get far enough away to find untouched resources.
I used to always think it was fantasy land, now I wonder what the chance it'll happen in my lifetime. I know it's a extremely low %, but it isn't 0.