Figure-skating powerhouse Sonja Henie and champion swimmers Johnny Weissmuller and 'Buster' Crabbe achieved celebrity gold in movies and on TV.If swimmers Michael Phelps, Ryan Lochte and Missy Franklin or gymnast Gabrielle Douglas take gold at the 2012 Olympic Games in London, they will probably end up gracing Wheaties boxes, get the chance to host"Saturday Night Live" or sign up for"Dancing With the Stars." And some may become TV sports commentators or announcers.