So, Rose leaves Dr Who and, I'm not ashamed to admit, eyes were not entirely dry at Cultural Snow Towers. I've loved this series (Intertextuality! Sarah Jane! ELO!); although the whole project does induce a sort of wistful melancholy at the thought of what Tom Baker might have been able to do with a half-decent budget and a smidgeon of CGI.
One thought. The last two episodes have established that there are multiple parallel universes, and movement between them is feasible, albeit difficult and unwise. Does this mean pretty much anything is possible? The original series operated on the principle of canonicity, so that if something happened, it happened; it couldn't be contradicted in subsequent stories. This did necessitate increasingly daft explanations as to how Davros was able to reappear, but at least it imposed some sort of continuity, not to mention discipline, on the writers. Oooh, when it looked as if the Brigadier had retired by the time of the Queen's Silver Jubilee, the letters they got!
But now, the Doc can just find himself confronted with something that's logically impossible, say "Oh bum, must have slipped through into a pesky parallel universe again!" and carry on saving the (a?) world. Sounds a bit like cheating to me.
And it means they could even bring back Adric.