There is a walkway between the lowly Caribbean Beach Resort and the Riviera DVC. So no wall.
I actually stayed at CBR recently so I can speak to this somewhat (although Riviera was still under construction). DD was a College Program Cast Member and we got a 40% discount to stay there. And even at that, I was like, "meh"

.
Honestly CBR is underwhelming so no wonder there was no wall. But the Fort is different:
- Those DVC folks will come over to the Fort to use our famous Trails End, P&J's Southern Takeout, and Hoop Dee Doo Review options at Pioneer Hall (although no doubt they'll have some bland dining options of their own).
- They'll come over to get in their jog or 3-mile walk rather than loop around their own paved parking lot multiple times.
- Chip & Dale's Campfire Singalong will be a draw (the other resorts don't have characters at their fires that I'm aware of).
- Pet owners who board their pets on property will want to walk them over to the Fort and dog owners to the dog park
- They'll probably rent or ride their bikes around the Fort or rent a Fort golf cart rather than peddle in circles in their paved parking lot. Or hit our exercise trail down to Wilderness Lodge.
- Wait till they learn about our 4th of July, Halloween, and Christmas golf cart parades (either as spectators or participants)
- You Halloween folks better buy more candy because the kids at DVC will be headed over with empty bags to Trick or Treat on Halloween night (especially you folks nearest Pioneer Hall).
- The general friendliness of campers - as folks walk the loops past my site, we either nod or say hello and they respond in same. Some even stop to chat about my Aliner, camping, my DIS sign, or whatever. How many resort folks get to know the people in the room next to them?
I get it - camping in an expensive trailer or rv is not for everyone. I like sleeping in "my own bed" while I'm on vacation at Disney World. I like to say that my camper is my cabin in the woods, my condo at the beach, and my timeshare at Disney. It goes with me on vacation nearly all the time (just got back from a wedding in Cleveland. In February. No camper.

). And DVC folks, most of them, are happy with their resort choice (other than trying to book non-home at popular times and the whole "walking" thing). But R will be paired with Riviera only for non-home stays initially so a 7-month reservation will be easy the first few years.
Which by the time it get's hard I'll probably be a full time Fort Cabin guy (I'm going soft in my old age! haha). I just don't want the Fort to change because it's being overrun by 900 rooms worth of people on their non-park days when they decide to come over and crowd things up.
Time will tell.
Bama Ed
PS - gonna keep my shot, patches, and powder dry, though, just in case.....