An Idea for Saving Downton Abbey

Has anyone noticed that Downton Abbey is becoming a pinch stale.  The "upstairs" crew is flat out boring and predictable. To inject some life into this sinking ship, I suggest that Downton take a page from the Simpsons and start to introduce some celebrities.  Given that the show is supposed to take place in roughly 1925, could Hitler or Stalin or Mao or Charles Lindbergh or Babe Ruth make a guest appearance?   By a "six degrees of separation" argument, the Maggie Smith character must know all of these folks?    Now that I live in West LA, I often have these kinds of ideas.  Call my agent if you'd like to work with me on something big.