I can picture Dany being resurrected by a Red Priest or Priestess. I think with the Iron Throne gone, her Targaryen madness would also be gone. When asked death was like and whether she "saw the darkness", she would answer that it wasn't like going into the darkness, but like having the darkness lifted from her.
She would give birth to a dragon-child by Jon and settle on a remote island to raise a new race of dragons. Arya's adventures might lead her to this island. Because the dragons would be Arya's cousins, they would probably take to her. Daenerys would probably give her the sword that Jon stabbed her with (which is apparently Lightbringer now), and Arya would later use it to protect the native cultures West of Westeros from Cortez- and Columbus-like villains.
Yeah sure man, whatever. What does it matter what some nobody has fantasized together? The series has ended.
Season 9 -- Cersei wakes up from having a very long and frightful dream
don't forget the books are still going. after Winds of Winter the next book is a dream of spring.