“The jersey and cleats worn Monday night by Redskins quarterback Robert Griffin III are headed to the Pro Football Hall of Fame,” The Post reported in December. “Griffin set the NFL’s single-season rushing record for a rookie quarterback during the Redskins’ 17-16 triumph over the New York Giants.” “Everyone wants to be in the Hall of Fame,” Griffin said. The Wall Street Journal this week, incidentally, had a look at the dismal attendance news at several sports halls of fame, even as national museum attendance rises. Excerpt: Museum professionals also say that the fast-paced Twitter generation seems less enchanted than their parents or grandparents by main exhibits that, by definition, change primarily when athletes are added to the halls. No living players will be installed July 26-29 at the Hall of Fame Weekend in Cooperstown, an unusual occurrence under the rules that govern election to the hall. “If you think about it, once you go through a hall of fame, you’ve kind of seen it,” said John Doleva, president of the Naismith Memorial Basketball Hall of Fame in Springfield, Mass. “You can’t appeal to kids who are 10 or 12 or 14 years old by always looking backward.” And while “single-season rushing record for rookie quarterback” might not be the type of exhibit that has frenzied fans studying their museum maps, “RGIII jersey” probably moves the needle a bit. Thus, this exhibit in Canton.