I don't care either way whether the Muppets do Simpsons/Family Guy/Robot Chicken/Greg the Bunny-style adult humor or the family friendly kind they are better known for. I remember when this series was announced, it was announced that the show would be edgier. Of course I only expected it to be that way for the show and no other Muppet production... Then was pleasantly surprised when that kind of humor was also used in It's a Very Merry Muppet Christmas Movie, and expected that humor to continue for years to come. I sort of wondered if they'd stop after Disney bought the Muppets, but they did continue that kind of edgier humor for The Muppets' Wizard of Oz and From the Balcony, before finally ending it by 2008.
But at the time, I had turned 18, and it felt like the Muppets were growing up with me. Like they'd been family-friendly role models for my entire childhood and teenage hood, and now were becoming more adult as I was graduating high school. Though even before then, there were times when the Muppets did stuff I questioned... Like when Rizzo sang "I'm Too Sexy" on Muppets Tonight (I thought it was odd that a Muppet would say "sexy"). Heck in The Adventures of Elmo in Grouchland, when Bert mentioned the movie Titanic, I thought it was weird they'd be allowed to mention that movie in a Sesame Street production, all because Titanic had a full-frontal nude scene (and this is keeping in mind that Bert never mentioned that scene, just that it had a sad ending).
But I'm thinking it might be best for the Muppets to stick with the family friendly humor/image they've had for years, with some occasional edgy humor, maybe if it's limited to the kinds of characters who WOULD say that kind of stuff. Like if it's limited to the mouths of Rizzo and Pepe, maybe also The Electric Mayhem (hey, back when Jim Henson was alive, she made those occasional remarks about nudity, though it wasn't a sexual kind of nudity).
Thinking about how Fox didn't want this show to have backstage plots, I wonder if they just didn't want to have to rebuild the backstage. Though keep in mind that Henson did rebuild the backstage TWICE that year (for the Weezer video and It's a Very Merry Muppet Christmas Movie).