Just had a thought.
Rose is making a life in the alternate universe, not with a half-human Doctor but with a half-Donna Doctor.
Haven’t decided if that’s creepy, touching, or hopeful.
Creepy because, well, ew. It’s so nothing I pictured or want to picture, Rose and Donna “together”.
Touching because she and Donna seemed to actually like one another.
Hopeful because, if part of Donna is living on in Doctor Two, then maybe there’s a chance that some day in the future, we may get at least some part of our Donna back. The Doctor may have mindwiped the timelord-enhanced Donna but not the Donna-enhanced Doctor Two.
It’s a small hope but one I’ll cling to.