They will all be gone IMO.
Marrone because he is a poor communicator, his offense still doesn't do 1 thing even remotely well after 2 full seasons, and his mediocre record is almost fully attributed to the defense which he is clearly completely hands off.
Whaley because he missed on the QB badly, the Watkins trade looks like TERRIBLE asset management, and not having that first round pick will likely cost the Bills a shot at one these established QBs that will be available this off-season.
I think the only way Whaley stays aboard is if the Bills hire a star HC like Bill Cowher, Jon Gruden, Art Briles, Nick Saban(gasp!-yes, they should try), or Gus Malzahn and they make him the de facto head of the football department, much like Seattle did with Carroll. But even then, the Bills will likely want someone more versed in contract negotiation and salary structure than a guy whose background is college scouting. The league is trending to more CEO types in the GM role than former scouts.