Re: What other Iron Man villains should appear in a sequel
Roarke said in an interview that they specifically ended Whiplash that way to leave ambiguity as to whether he's dead or not. We never see him blow up now do we? He could have deactivated the bomb in his suit and the immediate nearby drones after IM & WM split and then climbed out of the suit(assuming it doesn't need robot help with this) and then restarted the timer and covered his escape. Probably didn't end up happening this way, but that's how it is with ambiguity.
You know, it occurs to me that Captain America is basically the superhero equivalent of Mary Poppins. Practically perfect in every way and all that stuff.