Of course over geologic scales extinctions are quite normal, and nothing is static.
That doesn't mean ecosystems aren't normally resilient to perturbations on a smaller timescales: https://en.wikipedia.org/wiki/Ecological_stability
>Populations will get wiped out, species will disappear.
There is plenty of evidence that extinction rates are extremely high right now, and that humans are culpable. https://onlinelibrary.wiley.com/doi/full/10.1111/brv.12816