Comment by leoc
People in computing like Alan Kay and Ted Nelson were reading people like Postman and Marshall McLuhan and worrying about this kind of thing decades ago. Unfortunately, instead we've got to the point where the computer industry has created TV on the computer from the visionary post-war manifesto Don't Create TV on the Computer. And while it was probably always the case that most people would end up mostly taking the path of least resistance through their lives, the state of the technology is actively funneling them there, because it usually makes it so bloody painful, and sometimes quite isolating, to do things which are more thoughtful or effortful, or even just to do the same things in a more thoughtful way.
(Probably the single thing that most needs to get fixed immediately, right away, is to get content-addressable networking—IPFS, a better iteration of IPFS, your favourite alternative to IPFS, have your pick—up to an adequate level of practical usability, support and actual adoption. This is a blocker or near-blocker for many things, sometimes in unobvious ways.)
All that said, the fact that that Postman book is from 1985, still pretty solidly in the pre-Internet mass-media world, illustrates that the cultural-decline issue probably isn't really, or mostly, a computer or even a consumer-Internet problem. Revolution in the Head is another book of the same kind of cultural pessimism, also from (basically) the pre-Web era.