2. Zombie Horror Is Huge
As far as sub-genres go, very few can rival comic book movies (which are essentially a sub-genre of science fiction movies) in terms of popularity. Zombie horror (which, of course, is a sub-genre of horror) is one that definitely can. Television shows like The Walking Dead and movies like Shaun of the Dead and 28 Days Later have ensured that zombie horror is more popular than ever in the 21st century - so wouldn't mixing it with the equally popular comic book movie genre be a sure-fire recipe for success? That's exactly what a Marvel Zombies movie would do - it would mix comic book movies and zombie horror - and that's something that fans of both sub-genres would surely go crazy for. You can't exactly throw a zombie Galactus into the mix against Rick Grimes and his band of post-apocalyptic survivors, so throwing zombies into the Marvel Cinematic Universe is the only obvious way to make it happen.