It's funny, I'm trying to remember when I simply stopped using bookmarks. 5 years ago, maybe? 10? I'm not entirely sure. I used to have elaborate folder hierachies of bookmarks in my browser.
But at some point, I realized anytime I needed something, it was faster to just type a keyword or two in the address bar. Either it was there in my history, autosuggested, or my search engine would find it. So maybe it was when Chrome debuted the Omnibox?
I suppose it was around the same time I started primarily accessing files on my computer/drive with search (Drive, Spotlight) rather than navigating folders.
A few years later, I stopped organizing my 1000's of tracks into playlists by mood/theme, because now I can just think of a single track I'm in the mood for, and start a Spotify Radio based on that track.
In other words: I no longer extensively curate, because you just don't have to anymore, beyond a kind of bare minimum (a few project folders, a mega "favorite tracks" playlist).
So I guess I'm just curious: Delicious was wonderful when it existed. But even if it were brought back, is it a service people need anymore? Or have we moved on to a new paradigm?