The Doctor should not have left Donna.
Debate Rounds (3)
We also don't know if Donna could survive long enough to regenerate, if she could. While in the Classic series characters could regenerate after death, the new series has stated several times it is an impossibility. Donna's supposed regeneration would be nearly impossible according to recent canon, as there is almost no way she could survive being burned up for long enough to activate a regeneration.
While Tennant was able to gain a new hand after freshly regenerating, that was only because he had freshly regenerated. Let us also remember when almost every Doctor was weak after regeneration. Tennant fell into an almost coma, Smith went kind of crazy, and McGann suffered severe amnesia. While the growth of a hand may have been easy, and taken little to no effort, being in such a weak state and only being part Time Lord would make it extremely hard to regenerate a whole body.
Eccleston did have the Time Vortex in his brain, but his brain is more complex, and capable of containing it for a short time, much longer than a human brain can contain a Time Lord's. Even assuming the ratio is the same, Donna had just gone through a partial regeneration, and was weak before the event occured. Eccleston was in perfect physical and mental health, so wasn't as greatly affected by the Time Vortex as Donna was by the Doctor.
Thank you for your time.
All of your arguments are based on the assumption that Donna has the ability to regenerate, which as never been shown. Unless you're suggesting the Doctor use a regeneration on her to bring a happy, successful person, back to a dangerous and heart-breaking world. Yes, the Doctor could go back. But how many people would he hurt? It would be wrong and kind of dumb to use what you believe to be your last regeneration on someone to remove them from a happy life, only causing dread and fear in her loved ones.
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