I wonder if Chris Eccleston would consider an appearance again now. I doubt it though
I was hoping he’d be in the 50th anniversary show in 2013, so we’d see Paul McGann’s doctor killed in the time war and Eccleston’s doctor carry on with David tenant and Matt smith. Instead they put that awkward plot of having John Hurt slipped in as an extra ‘War Doctor’ I still liked John Hurt but for me his inclusion felt like a desperate need to have a more mean angrier Time Lord who would be more believable destroying Gallifrey, Time Lords and Daleks than McGann would have.