My prediction: response bias will drive only the bottom of the talent curve towards these postings.
This reinforces a bubble in which it's OK for candidates to decide what qualifies them for a job and shame companies over sour grapes.
I've interviewed with plenty of companies that don't do white board interviews. This doesn't mean they don't test for experience and aptitude. They just use different, often more appropriate tests, such as take home projects, pair programming and code reviews. I bet you these companies would disagree that their interview format results in hiring talent at the bottom of the curve.
We built this site for developers to find jobs that use interview techniques that model their work in the real world, without whiteboards or riddles.