I think the more that women's workplaces can do to support her choice to breastfeed, the better. The truth is, they benefit, because her baby will (statistically) be healthier and require less disruption an sick days, the longer she nurses.
I don't know that there needs to be a "special breastfeeding room" dedicated to that purpose in most workplaces, although it is certainly reasonable for larger employers, but I don't think that having a lockable space (not a bathroom stall, yuk!) where they can have some privacy and adequate break time to pump is not too much to ask, certainly. There are many health reasons in fact that could make use of a space like this (blood testing for diabetes, breathing treatments, injury care and more). For all workplaces to be aware of where they can make accommodations for employees is an act of responsibility and caring for their workers.