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thedoctor said:
As said earlier, Davies brough him in for the one series only. Eccleston was supposed to be the short-lived Doctor to give the audience the understanding of the concept of regeneration as well as a feeling that the show could change at any moment.



Thats not how Eccleston put it in the interview.
He gave indication it might go beyond one series, but he would not confirm one way or another!
I definetley got the feeling there was a possibility of him staying on, but it was very dependant on what he had going on outside the project.