Re: Renumber The Doctors?
The main problem is that since Moffat took over he's been drilling it into our heads that Smith is the Eleventh Doctor. The premiere episode is titled "The Eleventh Hour." The Doctor refers to himself as "the Eleventh" in The Lodger, which also features him wearing a jersey with 11 on it during the football game. And then there's the whole "Fall of the Eleventh at Trenzalore," which is kind of an integral part of the overall arc of the Smith era. So Moffat has gone out of his way to make sure we think of Smith as the Eleventh Doctor just to reveal that he's actually the Twelfth.
"Internet message boards aren't as funny today as they were ten years ago. I've stopped reading new posts." -The Simpsons 20th anniversary special.