Yesteryear Thoughts
I can see why this was shelved from being a live action episode. The sets would have been ridiculously expensive.
Since Spock's childhood would have little bearing on his life, I guess we could assume that the Andorian First Officer would be serving aboard another starship in the original timeline.
Interesting that the scene in the new movie borrows from the teasing scene in this episode. I guess its respects to D.C. Fontana.
I would've thought that after the events of City on the Edge of Forever, absolutely no one would ever be allowed to use the Guardian to go back in time.