The Borgified Corpse wrote:
What exactly has been the hold up in recent years anyway? Has the production team just struggled to write enough scripts to finish the seasons in a timely manner?
Moffat has, by his own admisson, been geting slower at writing and later at delivering scripts but for Series 7 it ended up being split because Matt Smith wouldn't commit to a fourth full series and they wanted him for the 50th Anniversary.
He should have been told that no actor is bigger than the show and this year should have been Capaldi's first full series.
Actually it seems production thinks he's bigger than the show, since they wanted to wait for him, not the other way around. They wanted him for the 50th, as you said.