Sure, that's the direct cause of invasive species. And I agree that there are measures that can and should be taken to measure and slow the flux of new species

Sure, that's the direct cause of invasive species. And I agree that there are measures that can and should be taken to measure and slow the flux of new species into established ecosystems. But biodiversity is a huge protective measure against invasive species gaining a foothold in the first place, and habitat destruction is by far the largest short term threat to biodiversity. My point is that habitat loss is the biggest factor in making these plagues possible at this scale. Diverse ecosystems are much more likely to be able to adapt relatively quickly to a new species than blighted habitats. I think its a huge farce to be focusing on "pest control" without getting to the root of the problem, biodiversity. We must be replenishing and rejuvenating biodiversity if we want to have any hope of realistically absorbing invasive species. And biodiversity has to be the focus over conservation. Our ecologies are not history museums. They're dynamically evolving, living superorganisms, and we should care for them appropriately.