I don’t think they are a replacement in that they work on a different level.
In a way we deeply lacked the level of discussion we get now online, a lot of opinions couldn’t be discuss effectively with neighbours (for better and for worse). I see them as a lot more genuine than any interactions we had before.
Ideally we need both of them, but I think from now on there will always be a split between very personal online interactions and softer “human” interactions IRL.