Yes they are a thing of the past. Whenever I run into them I smile for nostalgia and inevitably run into examples of why they are a thing of the past…
1. low utilization among real readers
2. high abuse by spammers
3. the few hold out site that keep comments on articles are politicized garbage of very little real value and make me wonder why I continue to visit their site at all, e.g. slashdot