It's a very comparable game of cat and mouse to spam email filtering. People also tried to claim that spam was over because for a time companies like Google cared enough to invest a lot in preventing as much as possible from getting through. If you've noticed in recent years the motivation to keep up that level of filtering has greatly diminished.
Whether model poisoning becomes a bigger issue depends on the incentives for companies to keep fighting it. For now in comparison to attackers the incentives and resources needed to defend against model poisoning are huge so it's just temporary setbacks. Will that unevenness in their favor always be the case?
If you live in a tech growth region get your truck driver, construction, bar tender friends or neighbors to be truly honest with you about how they view "tech guys" and the impacts of massive tech growth on their cities and the impacts on their personal quality of life and you'll learn a lot about how people feel, especially if they're renters.