Points can be adjusted despite the presence of fixed weeks. That's why those carry a 10% premium and are limited to ~1/3 of inventory for any use-day. If you use your automatically booked FW, it consumes all points associated with that contract, whether or not the point values change. If you opt out of your FW in any given year, you can use those points to book based on the then-current
point chart.
There is some disagreement about this. They
have done this in the past, but it is not clear they are
allowed to.
The plain language wording of the various resort POSes states that adjustments cannot change the total Home Vacation Point values associated with a "Unit". And, as far as I know, most of the Units at RIV include only Resort or Preferred views, but not both. For example (if I am reading the diagram correctly) only Unit 1C has both Views; all of the others are either all Resort or all Preferred. So, I would
think that they cannot reallocate across view definitions without violating the "Unit Total Cannot Change" requirement.
The other resort POSes also have this language, but Disney has apparently violated it by e.g. reallocating between "regular" SSR buildings and the treehouses, as well as reclassiifying views at AKV and BLT. In those cases, the total points
in the resort were held constant, but the total points for some Units did change. I think most of us believe that the POS forbade Disney from doing this, but in most of those cases, the changes were viewed by the Membership at large as "reasonable" and so no one really made a fuss over it. Probably the one that caused the most consternation was the Treehouses, which were originally sold as equal to 2BRs in point requirements, but later raised.
The RIV POS also has one other way it differs from some of the others. It lists the maximum reallocation values for the views
separately. The "maximum reallocation" value is the value per night of a particular type of accommodation if there were no seasonal or day-of-week differences. For example, the maximum reallocaiton value for a Resort Studio (called Standard in the POS) is 20 points per night; for a Preferred Studio it is 25. This suggests that
DVC views those as completely separate things.
Contrast that to e.g. BLT's POS. It does not call out views seperately but simply lists "Studios" as 15ppn under maximum reallocation. In fact, I assumed RIV's worked the same way until I went looking for maximum reallocation values a couple of days ago. I was very surprised to see them broken out by view.
Caveat: I am neither a lawyer, nor did I stay at a Holiday Inn last night.
But this did not change the point values of those rooms, so it could not have violated the Unit restriction. Boardwalk and P/G are the same point values, they just have different labels. This is the same thing they did at OKW when they created the HH category. So, they could create e.g. a "Skyliner" view out of that wing of the Preferred rooms, but if they followed the BWV/OKW precedent, it would still have the same point values as Preferred. IMO, all that would accomplish is further fragmenting the inventory, making one thing much harder to book.
Edited to add: I got the POS copies from here:
https://dvcfieldguide.com/public