1 Ophelia: So Will, what did you think of the ending of Harry Potter and the Deathly Hallows?
2 Shakespeare: It was just one author's vision. It didn't necessarily happen that way.
3 Ophelia: It was the author's vision.
3 Shakespeare: She has no more right to it than the fans!
4 Ophelia: All the world's a fan-fic, and all the men and women are its authors...

I'm hoping you didn't think there were going to be spoilers in the comic once you read the opening panel. I wouldn't do that to people.

I dithered on the last panel between Ophelia's line and this version:

Ophelia: All the world's a fan-fic, and all the men and women are its critics...

I'm still not entirely sure which works better. But I've made the call and it's too late now.

Will hasn't had a line for a really long time, by the way. I thought it was about time to use him again.

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2018-06-21 Rerun commentary: Will's comment in panel 2 is closely related to the Death of the Author, and may in fact be exactly the same concept, but even after reading a whole bunch about Death of the Author theory, I'm not 100% convinced that this falls precisely within that umbrella.

It's the closest thing I could find, anyway. Essentially the idea that the author of a work has no right to be considered more authoritative about the canon or interpretation of that work than anyone else. (You may or may not agree with this - I'm just trying to supply a reference for the sort of idea that Will is mentioning.)