8 Ways Doctor Who Could Actually End
6. The Doctor Lives A John Smith Life
This is another ending that's sort of happened in the show before, and it would definitely be an interesting way for Doctor Who to sign off for good.
In the 2007 Tenth Doctor story Human Nature/The Family Of Blood, the Doctor lives a normal, human life after stripping himself of his Time Lord biology. In a vision, we see him settle down and get married to (and have kids with) Joan Redfern, before growing old and dying, having lived a life that the Doctor never could.
Throughout the show's entire run (but particularly during the Tenth Doctor's era) we've seen flashes of the Doctor yearning for that normalcy, that family life.
Like Steve Rogers in the MCU, this is a character who's constantly at war, and just wants the fighting to stop. The Twelfth Doctor expresses this in Twice Upon A Time, calling his entire life a "battlefield", and musing "can't I ever have peace... can't I rest?"
Now sure, by "rest" he's talking about dying, but just like Rogers settling down with Peggy Carter in Avengers: Endgame, what if we saw the Doctor exit the battlefield by finding someone they can share a life with?
This also happened in the recent video game Doctor Who: The Edge Of Reality, with the Tenth Doctor marrying Madame de Pompadour in an alternate reality. It's indicative of the fact that the Doctor has become a more emotional and romantic hero over the last 15 years or so, and as such, it wouldn't be completely out of leftfield for the main show to end in a similar manner.