Christoper said he had disagreements with several higher ups on he show/network so he won’t be back ever (videos of that online).
Just heard Russell T. Davies is coming back as showrunner for the 60th anniversary, so him bringing back David wouldn’t be as hard as another showrunner doing it. That said, I don’t like the idea of a past Doctor playing a future Doctor. My 2 cents.
has a dr ever regenerated in his former body?