Now RTD is gone who was totally against doing a multi doctor story (expect for time crash which was a 5 min ep) Maybe the Moff will do a multi doctor story 1 christmas special in the future. Seeing Matt Smith, David Tennant and Paul Mcgann come together. I would say Eccleston to return too but i dont think he would after he quit the show back in 2005.

I could see it happening in 2013.

Time is a healer, and there's been a lot of water under the bridge since 2005. I'd say Chris Ecceleston would return if asked, especially for a 50th anniversary multi-doctor story.

The question is, who would be asked back? I think Eccleston would be more likely to be asked back than McGann, given McGann's lack of screen time as the Doctor. Obviously Tennant would come back.

True. I would like to see the 8th doctor back on the screen though under better writers than the people that wrote the movie.