it was a cool episode.
but just one question; how in the heck did The Doctor just HAPPEN to have the Seal of Rassilon on his person? he took it off The Master ages ago how could he possibly know he'd need it now?
though i am still confused over why The Doctor had to stay in Christmas for 600 years... i'll rewatch it tomorrow.
English
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If he left, they would have destroyed the entire planet. Including all the people, and the only way for the Time Lords to return. He still has loyalty to his people, but if they would have come back, they'd start the war with the Daleks would start all over again.
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So he was there purely to stop the Time Lords and everyone else having at each other.