Its difficult for any of us to know what this new world will look like but we know that VK pushed home-gardening hard throughout the summer so maybe your kids are on to something. Because you're right, most people don't know the first thing about self-sufficiency and doing with only what you need, not what you want.
LOL, We could all use a good dose of that.

I'm a Master Gardener - trained through Oregon State Univ. Gardening is much much harder than people think, thanks mostly to movies that show it's so simple (its not). And unless you have 20+ acres you can grow enough to feed your family either, you can help supplement it, but it will never be enough to be self sufficient. Foraging can help a lot, but people have no idea what plant is edible or toxic (I'm an herbalist too and a long time forager). Plus, foraged vegetation has strong flavors that people are not used to, so few would eat it if they knew it was safe. Lets just say it tastes very GREEN, lol!

I told my kids we can make a video this week of how to use your oven to dehydrate foods. I have two dehydrators but there are times I need more - and I use my oven. There are tricks to it ;) I grow celery indoors year round, I use a celery heart bought at the store but you can use the 'stump' of a celery head too ;) Lots of things to share...

We'll see how it turns out!