Let's hypothesize that from tomorrow, the knowledge to produce everything at home "DIY" becomes available because it's free (and even today this is increasingly true as the concept of patents is decidedly in crisis). We now possess all the possible knowledge to do everything ourselves. However, one thing remains missing for us to become self-sufficient, and it will always be missing regardless of the economic or political systems, as it remains a finite resource: time.
We can afford to imagine new systems and models because we have significantly more time than our predecessors. We have more time than our ancestors because we are highly specialized, and we exchange this specialization on a local and international level for services, goods, and raw materials.
In the scenario you propose, would we have the time to search for raw materials, study to understand how to process them, create the objects and tools we need, and simultaneously dedicate ourselves to other things (i.e.: while we are doing all of this, we need to attend to children, family, and the fulfillment of basic needs such as food, leisure, sleep, illness, etc.)
In my opinion, it isn't possible. I would more readily understand forms of anarcho-primitivism in which people decide to return to nature and primitive values, either forcibly (which might be feasible) or voluntarily (which seems highly unlikely). At least these do not violate the spatial-temporal limits in which we live :)
Friend, I love being as independent as possible, fixing things by myself and maintaining a garden at home, but I'm aware that it's just a hobby. It's a hobby I can indulge in because for other needs, there are others in the market to lend a hand. If I were to have a toothache tomorrow or if my glasses were to break, in a fully decentralized model like 100rabbits, I'd be in trouble :) Or perhaps, I'm still missing some pieces of the puzzle they propose.