Subject: I don't think he would have been perma-dead from the fall.
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Posted on: 2013-11-17 04:16:00 UTC
It seemed that, while the Doctor would regenerate regardless, the Sisterhood gave him their Elixir so that he would transform into a specific form and personality to fit the task ahead of him. They seemed to predict what he would request, too, since the lead Sister had a specific Elixir prepared for "warrior Time Lord" before the Doctor even crashed.
Eight wasn't the sort of person who would willingly use the Moment, the as-of-now ill-defined superweapon that ended the Time War by wiping out Gallifrey and the Dalek fleets around it, as well as creating permanent scars in the timestream, and a random regeneration might have ended up with someone like Five, who would be even less likely to take that sort of drastic action. There needed to be a Doctor who would do what was necessary to preserve what little was left of the universe's sanity, no matter how many lives had to be lost, and if the new mind was unable to follow through, the Time War would probably rage indefinitely.
When you consider the Doctor's core personality traits, a mind like that would have been almost impossible for him to create through random regeneration alone, especially when the new body was still getting accustomed to it.