But people DO sing - at football games, at karaoke bars, along to the stereo while driving, and yes, when drunk. Perhaps most of this is unselfconscious and not considered "being a singer", but, in the pubs where acknowledged traditional singers like Harry Cox could hold sway, did the people who joined in on the choruses consider themselves singers? Maybe there's a problem of definition here. Most people without disabilities can and occasionally do run but it takes a particular level of enthusiasm and expertise to class yourself as "a runner". That doesn't mean that running as a sport is dying out.