As far as the "change, my dear" thing, I thought that was more about the defensive posture the show assumed at about that time. When you do a whole season in which the Doctor himself is on trial, it's like you've internalized all of the criticism.
And it sort of sounds like they're telling the fans, "Wow, last season sucked. This will be much better." Of course, if the fans really thought it sucked, they wouldn't be watching it.
It was like when a new management team took over a certain casino, and the CEO went on and on about how tacky and awful the place looked. But what about all of the loyal customers who've been coming for years? You're basically telling them they've got no taste. That may or may not be true, but it's hardly the kind of thing you'll go on about.
The irony of the statement is that a lot of people consider "Caves" one of the best episodes of Doctor Who. I have not heard that said about the one that followed it.
Yeah but the trial season was later, after the hiatus...
End of the day there's not a lot of difference between Davison's last season and Baker's first ratings wise...of course when Colin returned for his second season the ratings had really tailed off, how much of that is people tiring of the show/actor is anyone's guess, but it does indicate that once the show was out of sight it quickly got out of mind as well.