Caribbean Beach doesn't have elevators, so I doubt they'd just convert the buildings into
DVC units. Maybe there's a way to add elevators to each building? Dunno. DVC seems enamored with high-rises at the moment, so things like converting CB seem unlikely unless it's a total gut.
I hope they expand the Skyliner. Even when it takes longer than other types of transportation, it's a pleasant way to pass the time. I'd love to see two expansion routes ... one to AK from the HS area and one that includes SSR/OKW and PO that connects into Epcot or HS. If the second line happened, I think you'd see PO converted into DVC.