The real story is that native retargeting via Facebook and Google kills their business as a stand-alone. And the bigger picture is that retargeting is not just an add-on to PPC, but revolutionizes how we all need to think about advertising.
It now means we must integrate marketing automation with our paid search. And thus, our content makers must own the mantle of amplifiers, since they know the target and are closest to the customer.
The casualties are agencies that have depended for so long on the traditional ad agency model: one and done, set and forget, “Super Bowl” campaigns, and media planning cycles. Might as well bring a rusty knife to a drone fight.