I mean, It has partially worked, information is more accessible than it would be if you had to go find a library and search through a ton of book that may or may not even have what youre looking for, or had to try to find someone who knew something or had some skill that you wanted to learn. And it has brought together people across distance, consider the number of online communities and subcultures whos members live in far-removed places, some of whom might be in fairly small towns or rural areas that just wouldnt have enough people of a particular interest to even have a branch of that community there. And it does also reduce the monopoly on dissemination of news and information that traditional media outlets and governments used to share. Its just, the predictions didnt also take into account that it would increase the ease of spreading false information either, or that not all debates have an answer that is obvious to everyone if only they are presented certain info, or that people wont want to talk to everyone and will instead choose to talk to those they find commonality with even given the means to talk to people they dont.
Back when computers were nowhere near capable of teaching kids, one can handwave away issues with the tech by saying “when the tech is ready to do this, it will be great” essentially. When the tech is at the point where it can sort of do something, but not do it well, one instead imagines how badly things might go if one tried the notion right now instead of at whatever point in the future the technology is good enough to actually do a good job.