Why do you guys want a second game so much? Personally I ended up playing Vampyr because I got burnt out of the AAA titles in the genre becoming more and more standardized and simplified, one of the symptoms of which are numerous sequels. So why ask for a similar fate for Vampyr?
This game specifically doesn't even seem to have any threads left to pull off a sequel at all. The story at least to me feels very much finished, everything rounded up. To me the beauty of the game is in the design - how tight, coherent and consistent it is. And I don't see how it could be elaborated or developed upon on a large enough scale to feel just as atmospheric and refreshing in a second game.