He kinda deals with that - he has also built another OS called DuskOS, which is when we still have modern computers lying around, but can't make more of them. It's the OS you would use prior to devolving all the way to CollapseOS
I feel like he has considered everything. He also has AbacOS which is an abacus-based operating system, for when we run out of energy, then HamstOS for a hamster-wheel powered operating system
HamstOS is just the microcontroller for the power supply. Pros: it is voice activated and fault tolerant. Cons: only responds to voice prompts beginning "Hey Mr. Binky". Also, it secretly hates you.