Then by all means, feel free to replace "Star Trek 2" and "The Hobitt" in my posts to read "other projects". But, as you say, they apparently weren't ready to begin production on the new series of "Sherlock" even after Trek and Hobitt wrapped, and even imply that Cumberbatch (and presumably Freeman) likely weren't to blame, so the cause of the delay must lie elsewhere.
With Moffat and Gatiss perhaps?
I wonder what they could have possibly been doing instead that would have caused them to fall behind so? Perhaps a secret project of some kind?