Are you in the US? I can't speak for other countries but I would have a hard time believing the US economy could devolve into that kind of situation. If it did, I think my original arguement still holds. FIRE seeking folks would still be better able to adapt to the situation. They would just step up their intensity.

Growing your food > making meals at home > eating at restaurants Walking/biking everywhere > public transit/carpooling > driving everywhere

Dealing with that sort of extreme situation would require extreme changes to your lifestyle. Building up skills to be more self sufficient and lower your spending to absolute minimal levels. If you are really interested in this, you might want to check out the Early Retirement Extreme book and forums. Jacob was an early FIRE blogger that focused on building skills to lower his expenses. I believe he was living on < $10k a year. That community is pretty hard core on slashing spending and closer to the prepper mentality it would take to survive hyper inflation.