KC should finish it anyway that he wants. So that when the artist looks back on his work he can say "I did it my way" and not for some fan you hasn't contributed a single thing beside his ear.
Personally I've read and watched all kinds of ways to explain it..... Now if KC can come up with something original that no one has thought of ? Then that would be the last nail in the We're Alive zombie coffin.
Outright? In my opinion "No", for the reasons that people have mentioned already - most pertinently you can't please everyone. If on the other hand you mean can Kc make most people satisified with the explanation of the cause? Then "Yes".
Personally, i think its important that we explore the cause of the situation. Granted I'm a scientist by education so of course I would say that but I also think it could be a hell of a ride from a story perspective.