It's pretty neat. So is Mastodon though, and the ActivityPub network feels a lot more active IMO. People aren't going to want to buy-into a DiD service just to microblog - Pleroma and Mastodon have much lower barriers-to-entry in that sense. In a way, it feels like Dorsey is star-struck by all the nerd porn protocols of the past and desperate to re-hash stuff that has already existed (eg. GPG, RSS, bitcoin, etc.). It's a valiant effort, but nothing will ever "replace" Twitter now. We are in a post-Twitter world, and people are learning to adapt. We need better glue to connect these disparate users, not Another Competing Standard with Blackjack and ID servers.