I think this post makes a mistaken leap in logic. Two actually.
First, why would you assume Facebook would depress a post from an influencer for any reason. Facebook makes money fueled by dwell time and engagement on posts. I cannot think of a financial scenario why Facebook would undercut their biggest stars.
Second, boosting an influencer post will make them bigger influencers, not smaller. I would happily encourage anybody to boost my posts. The economic value of content that is not seen and shared is zero. Every time a post is shared (paid or organic) the value of my brand goes up.
My final point is that Facebook is not necessarily the epicenter of influence marketing any way. Even if what you say is true, the influncers of YouTube, Snapchat and Instagram will continue to soar.
In essence, the argument made here is 180 degrees in the wrong direction. Influencer marketing is big and it will get bigger.