Originally Posted by johnnysaucepn:
“It's not a story arc. The occurrence of the phrase did not influence the plot in any way. The one place it was referenced prior to the 'big reveal' in the episode of the same name, it was a throwaway gag and the plot would have progressed without it.
The Impossible Girl stuff was a bit more, as it gave context and motivation to the Doctor's choice to travel with Clara.”
That seems about right to me. Bad Wolf was certainly something that ran through the series, but it was only in hindsight it became significant. The characters weren't taking much (any) notice and it didn't influence them. Whereas series 5 and 6 and (definitely!) 7b had overt stuff that the Doctor was actively engaged in (OK, it took a few episodes before the Doctor realised the extent of the cracks and that the Tardis was heavily implicated, but the audience had their attention pointed strongly to the cracks from the start). Impossible Girl had the Doctor all in a flap throughout.
I tend to take the view that if the characters aren't actively engaged in whatever it is then I'm not going to take too much notice until the finale. E.g. Missy in series 8. Vaguely intriguing but if the Doctor's not investigating it then I'm not too interested either.
That's the way I like it. Series 5 did quite a good job of an actual story arc but series 6 demonstrated the difficulty of getting it right. I'm perfectly happy with stand alone stories with some character development as we go. Preferably not the Doctor too much. That's what companions are for. Keep the Doctor as fairly constant for most of the time and let us see him through the companions eyes as they grow, change, get used to him, grow to like or dislike him or whatever.
That's not to say he should be set in stone, but a light touch with him evolving should be enough. Every now and then you can do a Gap Year Victorious thing. But that should be enough.
The only time they really need to meddle with the Doctor's character is when they get it badly wrong (series 8) and even then I'm happy for them to just adjust it asap without too much explanation. (Just explain it away as a post-regeneration sickness).