I've read the article but too tired/lazy to see through this very long thread, but I must say that Christopher Eccleston, great actor that he is, is perhaps a bit too precious not return, perpetually leaving his boats and bridges burnt. I know Eccleston took on the Doctor role relatively briefly and it was at an awkward time in his life (his dad dying), plus it's alleged he got on badly with one of the directors, but was the professional experience really that bad? It's been many years now.
But he's under no obligation to come back, he did a job, it's over he moved on.
Frankly the only thing that still somewhat surprises me about the whole thing is that he took the job in the first place, obviously he didn't know he was going to have a bad experience with certain people on set, and the loss of his father would happen at this time, but he seems a very profession, serious private man and he must have known that this was a role that might define him to a lot of people for a long time.
I'm glad he did take the role 'cos he was a great Doctor, I just wonder why he took it?