Good point. Symbolically it could mean that his son is able to put to rest something his father suffered with for most of his life;in essence, it's representative of Henry giving his father a new identity, such that he throws away/crumples his old life, and begins a new one as a grandfather. That is his role now, as given to by his son, who says, 'its time to be a grand dad now."
Look, the story structure of the entire series--if we are being totally honest--was half assed. The acting and character development made this season great, also the relationships. With the way so many questions went unanswered I really get the feeling some kind of quarrel happened between the director and someone at HBO. All season the director nick has been flat out affirming or rejecting plot theories, something completely unheard of by artistic standards. And now we have that tweet saying a scene was cut. Yes that's common, but with so many unanswered questions from the show I get the feeling that the season was supposed to be longer, but someone or something got in the way and so they had to wrap up a lot in the last episode. I mean, we don't even learn who was passing the notes for Christ sake
No way in hell this was intentional. If.it was, the writers should never work on TV again because they are breaking the basic tents of storytelling by telling and not showing, as well as leaving too much unresolved