I’d say its possible to retain most of your gains after PCT provided your estrogen is under control and water retention minimal, as well as you maintain the drive to train and eat properly after coming off. You may not be able to train with the same volume and frequency after coming off, but you’ll realize the difference between training on and off gear and adjust accordingly.
As much as it sucks coming off, training naturally is still fun and almost feels like you’re priming your body for another cycle. And its that much better when you go back on.
Try coming off and doing a PCT, and then decide whether or not you’d like to get back on and cruise. But I’d assume that someone who is B+C would have to use much higher dosages during their blasts to see significant results.