However, once David Tennant and then showrunner Russell T. Davies left after a handful of specials in 2010, Steven Moffat’s tenure started a slight, but eventual decline from the heights of marketing mania that the younger Doctors had enjoyed.
However, by time Peter Capaldi came into play, things weren’t as rosy, ratings-wise as they used to be for Doctor Who.
Ask any die hard Doctor Who fan, and they’ll tell you that the franchise hit its modern peak saturation during the David Tennant years, as both the dedicated fandom and the newly minted Tennant obsessives, drove the popularity of the show sky high.