To me, that isn't necessarily the case. It seems like they're putting more focus on the younger members like Leela, Chris, and Mando, since they could probably identify with the increasingly younger viewers, and vice-versa. Over the past four to five years, Bob and Susan have slowly been getting phased out, each appearing in maybe two episodes per year at maximum. Maria has also retired after 44 years on SS. The only mainstays from previous years are Luis (1971-present), Gordon (1974-present), Gina (1987-present), and Alan (1998-present).