my granddad was probably the last one of the generation i saw myself that was able just to put skies on, get a rifle and an axe and move whole family into forest and live of it in isolation. grandma knew all the mushrooms and plants and was able to collect eatable stuff from the forest - no one in my family can do it now, to know what is poisonous and what is not.
overall, these days, if anything happens and grocery stores will not have any food for at least 3-5 months, what will happen in all coastal areas like MA and south of us - it will not be survivable by most. by a 90% most, at least. fighting off hungry crowds you will run out of ammo in first 2-3 months, and what then? mine fields need mines and dynamite, where are you going to get it?
what will be - military will round up everybody into camps, men and boys will be conscripted, then women and kids in camps will die out of hunger, then it will be back to those who will hide away and survive up in vermont and deeper forests, but the forest is scarce resources wise and cannot sustain a lot of people for long.