I cried my eyes out with gutters. (I'll try to keep this as spoiler free for anon). When finishing it, I would have happily sacrificed Sealand to change the ending, but I felt bad for Sve and Fin, so instead I would sacrifice "boat guy" happily and without a second thought in order to save everyone.
I wouldn’t change a thing. See, there’s an underlying point here that a certain someone sacrificed themselves so that the others could live.
If he’d not let boat guy go with someone to somewhere, he’d be accepting the fact that the world really was going to crap and would be no better than the certain part with Ned. Though we all love him, I doubt he’d have changed a thing either- because at times like that he is the most selfless and foolish by putting other people first.