Re: Why the lack of Classic characters?
I don't know how much can Moffat be blamed, but BBC may not enjoy the association to a TV Movie that, for all intents and purposes, failed to re-launch Doctor Who as a show back in the late '90's.
"Spock...?" Kirk said, whispering.
"I am... most pleased to see again, Captain" Spock formally replied.
McCoy shook his head in disgust. "Oh, for crying out loud, Spock. Its been eighty years!"
"Seventy eight point four years, Doctor."
The Holy Three meet again, in The Return