No question that Moffat has left deeper marks on Doctor Who than any other individual in its history. And he extends and sometimes rebuilds the universe like he owns it.

Yeah, seeing The Impossible Girl and The Immortal Girl gallivanting off to Gallifrey the long way round in their own TARDIS stuck in Clara's Diner camo...you just say "wow" and maybe a little "wtf?" over and over...but you realize you're smiling like a fool.

I have to generally admire Moffat's skill in crafting Clara's story, especially at the end. Though I'm sympathetic to complaints that Clara was somehow wasted or not given a chance to live up to her full potential. But as I'm beginning to digest what happened, I'm seeing the Sorcerer's Apprentice story starting last season, when Clara first started behaving like she was The Doctor's understudy and more than "just" a companion. Moffatt loves to play the long game that way; this isn't the first time.

There have been rumors of a spinoff around not necessarily Clara, but the iconic school where she worked. But I agree he definitely set up a dynamite origin story for Thelma and Louise in a TARDIS, and the Coal Hill School spinoff could go its own way as a YA like the Sarah Jane Adventures.

I observed to ER below that the modern Who spends a lot of time torturing the Doctor, and in the finale, the thing that really squeezed my empathy gland raw and bleeding was the thought of the Doctor forgetting Clara. What a hole that leaves in the Universe. It's always been the case in the past that the sadness of the mayfly lives of the Companions compared to the Doctor, was somewhat offset by the notion that "they would always live in the Doctor's memory". Except Clara. Moffat plays rough sometimes. Doctor Who stopped being a kid's show a long time ago.