Viewers' Advisory service depends on library staff who really know the movie and television show collections. For Readers' Advisory, staff are committed to being well-read and knowledgeable about the genres, authors, etc. For VA service in libraries, RA staff may not be movie and television watchers, and, are therefore at a disadvantage to provide excellent service.
The question is how to get staff to become knowledgeable. Certainly, stressing the similarities of both RA and VA is the first step.