Love the idea to make it run on simple 8-bit CPUs that will be scavenged Fallout-style, but seems to presume that no 'newer' technology would survive and be functional.
Wonderful to see, none the less.
If we can't manufacture new smartphones, we need to have a baseline of computer to develop new computers that can eventually develop computers that can develop smartphones. Essentially he's proposing that if we lose our societal ability to compute advanced things, that we be able to fall back to the Z80 rather than the abacus.
Not sure I'm totally sold on it here, but it's an interesting topic to say the least.