I'm not surprised this show is loosing viewers. They need to turn this around or I think Who will be going away for a while again.
My worry is this: With both Moffat and Capaldi returning next series (whenever that is) what can they do to persuade people who've already tuned out to come back?
That's the question, isn't it? Almost anything I can think of -- new companion, an intense advertising campaign, a JNT-style "a familiar monster every week!" (
a la Season 20) -- wouldn't be the sorts of things that would bring people back. I'm not even sure that sacking Moffat would bring the mainstream audiences who have fled the program back; fans care about producers, general audiences couldn't tell you who the producer was. I hate to say this, because I feel he's largely an innocent bystander to forces beyond his control, but the way to reverse the slide, at least temporarily, is to replace Capaldi; he's the most visible thing in
Doctor Who.
Short of that, I think you go back to Matt Smith's idea for a "two Doctors" season. It's a crazy idea, but it would get people to look at the program again.