It’s too big now to just be a TV show, a diversion. Every couple of decades a great story comes along and grips us more tightly than all the rest, as HBO’s “Game of Thrones” has done, reaching a level of the Harry Potter novels, the Star Wars movies or MGM’s “The Wizard of Oz.” Thus, the common references become second nature (“Winter is coming”), major characters become ingrained (“Daenerys” autocorrects while texting) and everyone wants a personal piece of it, to talk about it in their own way.