Robert Crawley, Lord Grantham and Cora Crawley, Lady Grantham in “Unfinished Business”

The estate's safe in Mary's hands with Henry and Tom to help her. Edith has risen from the cinders in the hearth to be kissed by her very own Prince Charming. What more can we ask?

A long and happy life together, just we two, to watch the children grow. That's all I want.

And why not? We never know what's coming, of course. Who does? But I'd say we have a good chance.