It's Doctor Who, they can do whatever they want. They've always been quite forthright about the fact the "rules" serve the story, not the other way around. So, if The Doctor "runs out" of regenerations, they'll just write a story that has him gain more. (And if they bring back the Time Lord, this will be really easy, seeing as how they've done similar things before.) Really, they could just have The Doctor miraculously regenerate and "Whoa! Don't know how that happened but cool!" We'd all accept it (because Doctor Who is not about creating scientific realism) and continue watching.
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Le temps détruit tout
"Musicians are the carriers and communicators of spirit in the most immediate sense." - Kurt Elling
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