Winamp's goodbye might go in a similar fashion to Sonique's. Slowly and quietly. Sonique was a music player that was bought for about $20 million by Lycos (back in the dot com bubble days) and then shut down after it plateau'd in development and execs realized "dude, it's just a media player". It had a huge community (but no where near as big as Winamp's) and literally a TON (hundreds and hundreds of pages) of really amazing skins and visualization plugins. The site was shut down without much notice.
You can still download the lastest stable versions of Sonique on a fan site and it'll still work. I have a feeling that's how Winamp will be. Unless the developers release the source code.