For better or worse, I'm glad something like Sausage Party exists. Not since the days of Heavy Metal have I seen profile theatrical animation for adults. We're not talking about the lack of "mature" storytelling, because there are plenty of those in the CGI-animated family films that plague theaters nowadays, but those films are lumped in with the factory-produced, cookie-cutter crap created to sell merchandise and shill famous actors. It's the polar opposite to television animation, with its many different styles and age appeal. Whether its Japanese anime or western animation, comedies or action shows, 2D or 3D, there's always something for everyone.
In Hollywood, 2D animation is extinct. Some jerk in a suit decided that EVERY film had to be computer animated, had to have a celebrity in the booth, and had to be a movie for kids. Two stop-motion films in particular that dared to be different, the adult film "To Hell and Back" & the partially CGI-animated family film "The Little Prince", were screwed over and banished to Netflix. I'm inclined to believe that the only reason Sausage Party survived was because it was, in fact, a CGI film with a celebrity voice cast and they didn't know what they were getting into until it was too late. If that were the reality, the fact that Seth Rogen's name was attached to this should have been a major red flag, and the big wigs ignored it because they were total idiots.
Regardless, I'm glad Sausage Party made it, because it seems the only to fight this "theatrical animation ghetto" is to fight fire with fire. Only then will we take the first step in bringing diversity back to theatrical animation. There's nothing wrong with how things are, but things used to be better.