They didn't exactly need to get married to fix time. The Doctor married River Song, in order to get her to listen to him and to allow him to touch her, which would take them back to the lake and his death. She was refusing to let him die, which was a fixed point. In other words, it was a finely played piece of emotional manipulation on the Doctor's part.
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branchandroot
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Date: 2011-10-03 09:28 pm (UTC)