In such a series, which constantly breaks the fourth wall, the characters realizing they're fictional is in fact, pretty consistent with the tone of the series; like, when you look at it, suddenly, characters from a delusion world appear in the real world; characters from a fictional series appear before your eyes, and are able to bring you power EVEN OUTSIDE YOUR DELUSIONS; it's nonsense... unless you realize that in fact you are indeed in someone's delusion world
It reminds me somewhat of the recap episode of Aba (which, coincidently, also had Arakawa as head writer), where you have the main characters believing that they dream about being heroes (when they are salarypeople)...then realizing that in fact, the real dream is the salaryman life; they wake up, and suddenly, we must believe that Yatsudenwani has become a competent villain... the final twist being that in fact, all of that nonsense was Yatsudenwani's dream.
Besides, we know now who's the REAL Big Bad of Akibaranger: its head writer, Naruhisa Arakawa ( as seen in ep 11, when he doesn't let Doctor Z become good again )