Again, Joanie Loves Chaci, besides being a stupid premise and title for a show, was totally unnecessary. They were pretty much all that was left on "Happy Days". They hadn't been centering the show around Fonzie all that much at the time, and they finally got around to casting Jenny Piccolo just so they could round out the cast.
When Erin Moran and Scott Baio left "Happy Days", it basically left Fonzie, Mr & Mrs C and Potsie. Okay, sounds like some fun times!!!