Can you imagine what would happen if Zynga took their playbook and decided to build a weight-loss startup (the market for weight loss products in the US alone is $35 billion/year). Not to mentions the dozen of other billion-dollar self-help industries that can be transformed with game mechanics.
Sooner or later life is going to be like a MUD with standardized ways of measuring skills and comparing yourself against your friends. In a couple of generations time kids will grow up talking about "levelling up" in real life skills.
The application of game mechanics to real-life is only just beginning and it's going to have a huge transformative effect on how people live their lives.