If you don't mind my saying so, I think it's your point of view that's naive.

OP is talking about a large cultural shift, the type that skeptics said was impossible back at the advent of the web. The orthodox opinion was that the web was a fad and we'd all be reading newspapers and using coin-operated phones forever.

The scale of change that he’s describing — where the internet ceases to become a source-of-truth — would be a complete paradigm shift. Whether it's a "core part of today's society" is entirely irrelevant… newspapers were once core too.

The reason newspapers shifted away from being core is because there were other communication media to replace them. There aren't such replacements for the Internet.

I dont think we are talking about replacing "the internet", but replacing fb/twitter/insta with many many more micro communities that might be a bit more gated for entry due the cheapness of spam. These types of communities flourished in the 80s-2000.

Urban Buildings were important before WWII firebombing.

I don't think it would be progress to abandon cities because someone figured out how to destroy them.

I don't. I think it will be approached differently.

> Internet is core part of today’s society

Processing is _the_ core part of all society. The internet has enabled compartmentalized access to specific types of information. Eventually humanity will realize that the information in their technology is fundamentally the _same_ as the information they deal with day to day. Instead of being subjected to the emotional magnet of these technologies they will be incorporated _into_ our daily processes to enhance them.