You guys aren't getting it. These are AVERAGE ratings for Tennant's and Capaldi's entire runs, not a comparison of 2005 ratings to 2017 ratings. This isn't Capaldi losing 2 million viewers in a year, but being down to only 4.5 million viewers average during his two years to date. And while you make excuses like it's been a year between seasons, the general consensus is that the Capaldi era just hasn't been good for several reasons. Too old, no romantic chemistry with Clara, overly complicated scripts, etc. I even see supporters saying they're bummed that Capaldi is leaving just as he's finding his groove in the program. Sorry, but it should not take you three years to hit your stride if you're the right person for the role.