I am still using Winamp, version 5.623. No plans to change as no other music player has proven itself as versatile to me. MediaMonkey, Foobar2000, MusicBee, XMPlay - At best I could hope for it to be the same, but I've yet to have an alternative even get there. Part of my music library includes music from games, which I have in their native formats. I have winamp plugins for countless dozens of video game and computer systems which emulate the sound chips and play that music. I'm not about to spend countless hours converting those files into standard audio files to switch to another Music player software without a very, very good reason, and being more recently released or updated doesn't matter to me any more than having shuffled the UI around would.
The really weird thing is I've found that often when I mention this on forums suddenly I'm dogpiled with suggestions, as if getting me to stop using Winamp is like getting some poor homeless person off the street. I don't get that mindset. "What about X didn't you like" or "Have you tried Y" or "You know Z provides <Winamp feature I never mentioned nor care about>".
I don't expect Winamp to be surpassed because it's "type" of software has been largely surpassed. Nowadays very few people actually keep t heir music local. They either use one of the many storefronts and keep the music "in the cloud" and download it only to play it, or they use one of the variety of streaming services or Internet Radio. But I'm old fashioned and like to have propriety over the music file itself. I feel the same about video as well (For which I don't use Winamp)