Hence the point that companies (say in San Jose) should allow remote work to attract employees in SF.
you're preaching to the choir
I don't think this is necessarily conscious; I just think that businesses sense a power differential that comes with remote work: part of it being a tacit acknowledgement that this really expensive area is not the best place ever for talent, part of it being that this employee has a much better living situation comparatively, and part of it being that not seeing them in person regularly means less warm fuzzies for management.
Progressive minded businesses make it work by realizing that empowered workers produce better work. Everyone else hobbles by doing what everyone else does to stay into the warm blanket we call groupthink (aka 'best practices').
And then there are the jobs were you work remote with a week of office time every couple of months. Still a far cry from "working a day or two a week from home".
http://weworkremotely.com/ claims to be a directory of mythical places :-)