To put things in perspective VWL/BR has about 2 million points. Thus a dues increase of ten cents per point--or $20 per year to an owner of 200 points--brings in $200,000 of added revenue to cover operating costs.
The primary additions to VWL which come to mind are expanded pool (higher maintenance + presumably lifeguards), Community Hall, sports courts and grills. Operating costs and maintenance of these amenities will be shared by BOTH
DVC condo associations and the hotel itself. With Disney paying for construction, I really don't see these additions as adding any massive financial burden to owners.
5-6 years ago Saratoga Springs added a second feature pool which similarly increased staffing and maintenance costs. The impact on dues was basically undetectable.
Other resort profit centers like restaurants, marina & gift shops are owned and operated by Disney with no impact on member dues.