The movie tries to tell us that everyone is unique and special. We learn that Morgan Freelegoman's prophecy was made up and there was no special individual destined to stop the villainous Lord Business. Emmet's success in spite of that proves that everyone is talented and interesting and extraordinary ... but everyone's personality and actions are preordained by higher beings.
Remember, the entire Lego world we witness exists in Will Farrell's basement. How can everyone be talented and interesting when Ferrell and his kid decide what skill sets people get and what adventures they go on? How can everyone be extraordinary when they only have so much time to devote to each figure? Some characters will simply never achieve greatness, and there's not a damn thing they can do about it.
Warner Bros. Pictures
"This Bunny Suit Guy will make a great heart attack victim for the ambulance driver
mini-figure to learn that he can never save everyone."
That's a painful realization that most adults come to over the course of many years, but since part of raising children is trying to make their lives easier than you had it, why not teach it to your kids in about two hours?