Besides the Time Lords, maybe the White Guardian is still around and will give the Doctor a new set of regenerations in exchange for finding the pieces of the Key to Time.
Sometimes I wonder, if the Face of Boe, isn't an example of unlimited Regenrations (Not the same as the Doctor being reborn, but, Jack is regenerated after a death) eventually breaking down, versus Time Lords on the 12 Regenerations Program.^ If that's true, Time Lord biology must be quite hardy. I would have thought that after enough regenerations, their bodies would simply wear out from overuse.
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