They have to keep this in early 80s, otherwise it loses relevance. But I'm concerned if the theme will resonate enough today. (Not saying women have completely equal rights in today's workplace, but things are better today than in 1980.) Though I never saw 9 TO 5: THE MUSICAL, I felt it was a similar theme from a similar era that today's audiences don't feel drawn to, and could have been why it had such a short run.
That said it's one of my favorite films and one, like a few others, as I watch it I think how a scene could be set on stage or set to music.