I haven't been to CCV, but we stayed at Caribbean Beach in November of 2019 before RIV opened and used the Gondola system, and It. Was. Outstanding. It remains one of the single biggest reasons we would do DVC, I even told my wife that if we can't get into RIV I probably wouldn't care much for DVC otherwise. Obviously capacity may get tougher as RIV fills up and also uses the Gondola system, but it would have to increase a lot to create a real problem based on what we saw when we visited. At the end of a long day at HS, while people were still walking to their cars or waiting on busses, we immediately boarded the Gondola and were back in CB within a few minutes and back in our room before most of those leaving HS were finally getting a seat on the bus. There have been plans floating around of the Gondola system expanding to MK also, but so far they are just blueprints and nothing has started construction yet, so who knows.
Anyway, the RIV rooms we toured at SSR were excellent, and most everyone that has stayed at RIV seems to really like it, even on here I have seen a lot of people who were "Never RIV" say they bought an add on package after trying it for a night.
So again, haven't stayed at or even toured CCV, but RIV rooms are nice and the Gondola system is fantastic. As another mentioned, the RIV dues were a huge negative for many, but since those dues launched we have seen nice size increases in dues for other resorts but RIV has been pretty flat. Our guide said it was because RIV already had the new minimum wage agreement for employees built into the dues and the other resorts would see their increases in 2020/21, and that seems to have happened. So while nobody has a crystal ball, I would be surprised if that gap didn't continue to narrow until it makes nearly no difference.