Fam from OUR perspective sure anything is possible because as the audience we can see everything but in the show, remember the men at castle black didn't even believe Giants existed until the attack and Tywin and Jaime casually made fun of the Night's Watch and their "ridiculous fables of the wall" as they put it. They told Tywin a dozen times Danearys had dragons and he didn't believe it until Jorah sent him word that it was in fact true.
Think about this, they don't even know the NK has a dragon yet so imagine how they're going to respond once they see it. They're completely unprepared for that. This is what the show is all about.