Director Dean DeBlois talks about HOW TO TRAIN YOUR DRAGON 3 and possible future sequels.
When I was approached about a sequel, I said will you consider it to be the middle act of a three act trilogy? Therefore we’re not just inventing a random other adventure that you cast the same 5 or 6 characters into and graft on a problem that feels artificial. So by meeting Hiccup at this later stage of his life he’s now dealing with an organic and universal problem that many of us go through at that stage. But it is the middle chapter heading toward the culmination of Hiccup’s final coming of age.Source: /Film