The rollout and transformation, if it happens, won't look like all this stuff becoming so easy that every individual can run a server. But it is possible that every extended family will have at least one member who can run a server or administer a private network for the whole clan. And that's where tech like tailscale's offering will come in. That's where I see the author's vision being a believable moonshot:
Each extended family, and some small communities, with their own little interconnected, distributed network-citadels, behind the firewalls of which they do their computing, their sharing, and their work. Most family members won't need to understand it any more than they understand the centralized clouds they use now. And most networks won't be as well secured as a massive company can make its cloud offering, but a patchwork heterogeneity of network-citadels creates its own sort of security, and significantly lowers the value of any one "citadel" to even motivated adversaries.