I'm fine with Lu being the last one standing if they do a complete revamp since Bethenny has zero interest in returning again which is a shame cause she's needed more than ever. Lu is entertaining, eccentric and can be a hot mess & serve the goods without the danger of being "cancelled" unlike Ramona where it's becoming more and more of a problem especially if they're aiming to bring in a younger audience.
In order for the revamp to work, they have to start fresh with a whole new dynamic, interesting, youthful cast (besides Lu who can be the sole OG) and really allow the chemistry and relationships to grow and develop.