PHILADELPHIA — There’s a scene in “Creed” where the latest brash boxer who challenges the upstart protege of Rocky Balboa barks, “No one cares about Balboa anymore!” Yo, through 40 years of Rocky as an underdog, champion, and aging, widowed fighter, fans sure do care. Dressed in robes, fedora hats and even boxing boots, the costumed enthusiasts chanting “Rocky!