What's unrealistic is the widespread state of IT ignorance among the masses and the kleptocracy that profits from it.

Without this widespread ignorance, and with IPv6, a global per host, and without the disappearance and massive price hikes of RAM and storage, we could all have a home server running, for example, a family's personal services:

- contacts (Radicale/Baïkal/Davis/*)

- photos (Immich, PhotoPrism, ...)

- video (Jellyfin and the like, even Stash for those who fancy it)

- files in general (e.g. SyncThing)

- email (fetched via OfflineIMAP and similar, served via Dovecot+webmail for those who want it, etc.)

- federated XMPP/Matrix for family and friends

- ...

And even for the State, a national blockchain for digital identity (NFTs), contracts (e.g. property sales, etc.), and money, with a node for every family and consensus to regulate it, for maximum resilience and reliability, thus also enabling electronic voting.

But well, given the widespread IT ignorance, it's just a pipe dream.

In this model, we would have de facto teleworking, and therefore de-urbanisation, with houses and sheds with solar panels on the roof, batteries, and activities shifted to maximise self-consumption—thereby electrifying without loading the national grid, in a true and substantial transition that would otherwise be unrealistic.

Personally, that's how my house is, national blockchain aside (but with a personal lightning node anyway), and it works beautifully; it would work brilliantly up to ~45° latitude across the EU and slightly less (I think, I haven't checked the PV maps) for North America. Simply doing this would kill off the aforementioned kleptocrats. No cities means:

- no end to private property for the majority

- no dependence on private collective transport in the hands of a tiny few

- no fast tech/fast fashion with very low costs for the vendor but high costs for the customer and nature due to the piles of waste

- no ready-meal deliveries with tons of packaging

A resilient, renewable society (including the built environment) that can evolve but doesn't have the majority enslaved to a tiny few. This is why it isn't happening.