Board Thread:Wiki/@comment-24930713-20150810223555/@comment-5774380-20150812200831

I don't think so. That's similar to the original end that Isayama had originally planned for the story where everybody dies tragically; but he said that after seeing the success of the series, he had to think on another end because that could negatively impact the fans; so for the same reason, I don't think he will kill one of the protagonists and leave the fans shocked because he died without realizing his dreams.

This chapter was intended as a preparation, with everyone remembering the events of the past months, their dreams and motives, before departing to another adventure; so I think Armin's speech was just that, to remind the reader what they have passed for and what they are fighting for.