What do you make of the notion that since anti-discrimination rights in the workplace are comparatively new, that they could be overturned?
While there's not much of a push to, say, get rid of gay marriage, there is
a major constituency in the U.S. that genuinely believes in the "right to discriminate". And there's a history there of good faith pro-free-market arguments. Hell, Nobel Prize winning economist and political thinker Milton Friedman even thought as such, and he wasn't one to adopt positions that had no basis on some reasonableness.
While condemning bigotry, as a matter of principle it's possible to say that a company should be allowed to fire, not hire, refuse as a customer, and so on anybody who's black, gay, Jewish, Muslim, or whatever. It's the free market. It's the right to property. The right to self-determination. Businesses should be left alone by a Constitutionally limited small government to discriminate as they see fit.
I don't personally buy any of that. But a lot of conservatives and libertarians do. Could that carry the day in the future?