I am not sure about the premise that the "surge of mobile ad-blockers" in the developing world will translate to "skyrocketing" usage of ad-blockers in the US. I think the incentive to limit data usage by blocking ads is stronger in the developing world than it is elsewhere (less disposable income, lower data caps, possibly higher data rates).

The article seems to trust PageFair's assessment but only mentions in passing that they make money helping companies recoup lost ad revenue, and spreading fear over higher ad-blocker usage probably helps them gain clients.