I’ve run a small farm and know what it takes. Nothing “presumptuous” about it.
Things don’t just pop out of the ground. Not a lot of available land in the cities, for starters. A tomato plant in the window ain’t gonna cut it. Suburbanites will do better, but it takes time to grow things to maturity. People better start getting canning supplies. How many have wood burning stoves to cook on when the electricity fails? How much wood do they have and where are they going to get more? When propane is no longer available?
Think you can go out and live off of the fat of the land? People that live out there catch you hunting they’ll shoot your a$$.