A quick thought around my original Game Thinking content from a few years back.
I often listen to others talking about gamification, serious games and the like, as if they had no relationship to each other. Whilst it is true that they all require different approaches to develop solutions with, they should not be considered as totally exclusive of one another.
A good gamification consultant will look at the problem they are given and decide what the best solution is for their client based on their needs, not on the semantics surrounding the difference between gamification and serious games. If the solution requires a game, that is what will get made. If it will benefit from gamification, with some learning based games and maybe even a few pure entertainment games, then that is what will get made!