Land and food will always be valuable. However BTC can become worthless overnight. Cut power, the ISPs aren't providing access to the webz where you can pay or accept BTCs, and BTC has lost all it's value. You don't have to turn off the internet to do that to BTC, either. 'Them' can just censor it. Not tranmit information about it. Same result.
Otherwise, yep. Food is valuable. Fiat not so much. I don't get your hatred of real property. It's valuable because you can grow food on it. Because food is valuable, what you need to grow food is valuable.
Thanks!