User blog comment:Astrid Skylar/Who thinks that they should make a third one?/@comment-24018437-20140701092736/@comment-24949049-20140703015037

I actually back up what Megadracosuarus says. In an interview with DeBlois himself, he revealed that he wanted to end HTTYD 3 the way the first novel began. With Hiccup saying something along the lines of "There were dragons when I was a boy."

But there is something to note: DeBlois mentioned there would be AT LEAST three films...he's hinting that there maybe a fourth. While Hiccup's story may end in HTTYD 3, we may follow his and Astrid's descendents in a possible HTTYD 4.