I think they gave up on the Android version of Rockbox because it wasn't really Rockbox and there are countless good music players for Android. Rockbox is still in active development btw, they just haven't done a major release for whatever reason. See http://www.rockbox.org/wiki/MajorChanges for a list of changes since the last 'major version' years ago. The little Sansa Clip+ is still going strong!