The future of job boards...

Maybe I am missing something, so allow me to pose this question to fellow job board owners and our aggregator friends as well:

Major players in vertical job search engines, Indeed.com and SimplyHired.com and others make it simple for our paying clients (employers & recruiters who purchase job posts on our boards) to feed and promote (PPC) their job openings directly to their respective search engines.

Other products, including Hound & Linkup (& more?) perform the same act for employers only. Sometimes they charge job seekers (Hound), and sometimes employers + PPC (Linkup). In fact, Harrison Barnes, CEO at Hound openly speaks of his hatred of job boards in his pitch to job seekers to sign up for a subscription. http://www.hound.com/gjceohatesjobboards.php

So... what’s the future for job boards driving revenue from ad postings?
Why pay us, as middlemen, when the vertical search engines will gladly scoop up the employer's posting and push it to the top of search results for a few dollars?

We all know the landscape of online job search will continue to change with time. Is extinction of job boards the long range impact, intentional or not, of the aggregator industry and folks from Hound & Linkup?