Keep in mind that the Caribbean Beach Resort area is very close to Epcot.
One DVC /CBR rumor has Disney building a new DVC structure on the land currently occupied by the Barbados and Martinique sections. That section of land is only about a quarter of a mile from the back side of Epcot's Africa Outpost section. If Disney were to build a walkway and/or waterway between CBR and Epcot, the distance would not be much further than the distance between Boardwalk Villas and the France Pavillon at Epcot.
If DVC were to build on the southern end of CBR, the distance between the new resort and the back side of Epcot would still only be about a kilometer. That parcel of land would also be less than a mile from the entrance to Disney's Hollywood Studios.
All these distances assume that Disney would build additional walkways or waterways connecting CBR to the Parks, which would involve crossing Lake Buena Vista Drive or Victory Way. Although they could be built, the cost may be more than reasonable for the project.