The addition of Kingpin to a future Guardians Of The Galaxy film would certainly make for an interesting proposition.
Not just because it would open up the possibility of Daredevil, Jessica Jones, Luke Cage, The Defenders, and more crossing over to the big-screen, but also because Vincent D’Onofrio has been roundly lauded for his portrayal as Kingpin, and would provide a formidable counterpart to the fun-loving posse.
Of course the one big problem with this proposal is that, while it is still part of the continuity of the Marvel Cinematic Universe, Daredevil and its characters have so far only appeared on Netflix, while Guardians Of The Galaxy is one of the studio’s most prized and lucrative cinematic franchises.