Trivia: In one version of the script, Martin finds another videotape of his father Seth. This tape would show Seth (who is in his part-fly form) explaining the "cure". This scene would have required Jeff Goldblum to be in make-up for five hours, and he didn't want to go through that, so he dropped out, and the scene was cut from the script.
Trivia: At the end of the movie, the mutated Bartok was played by director Chris Walas' brother Mark.
Trivia: Geena Davis was originally going to reprise her role of Veronica Quaife. But, after learning that Veronica would die during child birth, she pulled out.
Chosen answer: Presumably they go on to live relatively normal lives. The scene at the end of Bartok is meant to show that his employees have no sympathy for any creature, including him, who is suffering. At least some of them are aware it's Bartok, yet they allow him to be imprisoned and gawked at, just as they did the dog.