I also wish we brought back interesting discussions in a medium that is not corporate-controlled, but I do not long for those crappy forums. I always thought they were a major regression. We had Usenet, and it had easily filterable threaded conversations with a plethora of good readers. The only thing it lacked was good inline image support, but that could have been bolted on. Instead, we started implementing those terrible forums. The necessity to bookmark multiple forums if you wanted to participate in multiple discussions. Bugs, captchas... There were a ton of difficulties with accessing those. And, of course, you had to register for each one with a username and a password.
The internet today still does not have a good discussion medium like Usenet, and I am not sure if it ever will.