Although I have not done any in depth analysis, my guess is that this issue would become more legally significant to an employer, as opposed to just a difficult pragmatic and moral issue, if the WRFA were to become law. That is certainly the hope and view of some advocating its passage. The Family Council's website discussion of the WRFA clearly states their view of its purpose:
Policy Goal: The passage of the Workplace Religious Freedom Act (WRFA) would help to ensure that American workers will not have to choose between their faith and their job. The WRFA would create a climate that encourages both the government and private sector to greet employee requests for religious accommodation with respect and consideration rather than suspicion.
In 1996, Kmart fired Karen Brauer, an Ohio pharmacist, for refusing to dispense Micronor, a birth-control pill. K-mart did so even though Ms. Brauer had informed them when she was hired in 1989 that, based on her religious beliefs, she would not do so.
The WRFA would restore the intent of Congress in Title VII by providing clear statutory guidance to those employers who wish to comply with the law but are unsure what level of deference the law requires. The WRFA is also good for business, as it is likely to significantly reduce employee lawsuits and any associated costs.
The argument for the validity of the WRFA should be on the basis of whether the costs that will be incurred by business (which of course ultimately means by all of us as consumers), as well as the costs to those who might be harmed by newly empowered employees exercising rights given them by the WRFA, are worth it to obtain the policy goal being sought.