A large part of the modern extinction is the deliberate and accidental introduction of species from around the world.
Think brown snakes eating bird eggs in the Pacific, mussels in the Great Lakes, the spread of local diseases from all over the world to other parts of the world.
The result is a loss of some species, especially specialists driven out by competition with generalists, species that lost their protective behaviors and many with very small ranges lost to development like agriculture.
However, they’re finding that invasive species become part of the ecosystem in most places, and as long as keystone species aren’t lost, the overall strength of the food web increases.
So kudzu is a plus when it gives local species something else to eat, but Asian beetles that kill 90% of the trees are bad.
Yes.
And most of this has already occurred.