Y'know how both "6-7" and Gangnam Style were both annoying at their time? As time goes by, people won't be annoyed by "6-7" anymore! Just like Gangnam Style.
Y'KNOW, I DON'T THINK WE NEED TO GET RID OF "6-7". BACK IN 2012, GANGNAM STYLE WAS ABSOLUTELY CRINGE. AND LOOKING BACK AT IT TODAY IS JUST SO NOSTALGIC.