From the article:
We can expect to see Facebook deemphasizing traditional advertising units in favor of promoted news stories in your stream. The reason is that the very best advertising is content. Blurring the lines between advertising and content is one of the most ambitious goals a marketer could have.
Bringing earnings expectations into this, the key to Facebook 'fixing' their mobile advertising problem is not to create a new ad-unit that performs better on mobile. Rather, it is for them to sell the placement of stories in the omnipresent single column newsfeed. If they are able to nail end-to-end promoted stories system, then their current monetization issues on mobile disappear.
I still hope it's rather their users who will disappear.