I’m not convinced they’d just revise C&C, or revise it and “save” some rotating cards. That would leave them with five product categories in market at once: Core, revised Deluxe, “old” Deluxe, Datapack, Campaign Expansion, and new all-faction Deluxe. Not particularly coherent.
The only thing I thought of is what if the other H-B and Shaper IDs in R&R are NEXT and Kit? I think the only way to deprecate C&C would be for R&R to replace it in a way that signals the new direction for the deluxes, while providing a bridge to the past and partially answering for the “but you said deluxes would never rotate” question that would come up.