Okay I know I'm ranting about this at this point but. It baffles me that gamers can look at the concept of the G-man and definitively say "this story is not allowed to end until we know exactly who this guy is and who his employers are." What??
He's a symbolic entity! His whole gig is that he's mysterious and works for something even more mysterious. Do people seriously think that not revealing everything about him is "sequel baiting?"