The market very much recognizes the cachet of the RSF moniker. I can demonstrate a 15% premium for homes located in the Covenant area vs. similar homes located on the periphery. I never did think of Cielo or the Crosby or Santaluz as being part of RSF. They should split off and call themselves Del Dios or something different to distinguish themselves.
We see the same thing in the La Jolla area. The listings for a lots of homes on the north end of Pacific Beach use the La Jolla location in their addresses if the agents think they can get away with it.
With that said, I don’t think the majority of the residents of RSF are really that interested in having their own city; and I doubt that maintaining cachet is the primary motivation for those who do want their own city. The reason most towns incorporate is because they want more control over their public services, especially police and fire protection.