Major Spoilers Question Of The Day: Gallifreyan Casting Call Edition

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With the 50th Anniversary of Doctor Who looming next year, rumors are swirling that a multi-Doctor story may be in the works.  Though the Fourth through Tenth Doctors are still alive (albeit many years older, and in the case of Doctor Six, nearly unrecognizable as their younger selves) Chrisopher Eccleston has reportedly stated that he would not be interested in reprising his role.  Of course, none of the three previous TV multi-Doctor stories has made full use of all the surviving Docs (William Hartnell was ill during the filming of ‘The Three Doctors,’ while Tom Baker sat out ‘The Five Doctors’ and only Two and Six featured in ‘The Two Doctors’) but there is, at least, a precedent for recasting The Doctor.

The MS-QOTD (pronounced, as always, “misquoted”) contemplates the Time-Lord Triumphant, asking: 
Should the BBC recast any missing Doctors for the 50th, or just make due with as many of the surviving actors as they can get?