Synecdoche, New York: A Great Film About the Upcoming Zombie Apocalypse?

I've got post ideas for some of the deeper themes of Synecdoche, NY, but figured it might be more fun to open debate on one of the possibly sillier themes. Synecdoche is obviously a movie about the "small horrors", the horrors that occur to a person naturally through the course of decay. Decay is an obvious, deep theme of the movie. The film was always meant to be that sort of a horror film, as from this Synecdoche interview at AICN:

...what happened was that Spike [Jonze] and I originally were approached by Sony to do... to do a horror movie, and we talked about ideas and we wanted to do something that sort of wasn't attached to the genre notion of horror, and so we were talking about things that are scary in the real world, and in our lives...

I think that perhaps the truly amazing part of Synecdoche is that it also merits the debate over whether or not the movie also contains large horrors. The movie wraps us up in all of the small horrors, but then leaves enough ambiguity if you start to wonder about what is happening at a larger level that there is certainly room for interpretation. I shall provide one interpretation, what I consider a "silly" interpretation and I certainly have very little idea about its overall validity, but it is a fascinating angle of the film to talk about: I think that Synecdoche is "secretly" a movie about a Zombie Apocalypse, and if it is, well then I think it may truly be a hallmark film for Zombie Apocalypse films.

First of all, I think its important to start from the realization that the point of view of the film is largely Caden's, and even when Caden is ...