Ecosystems are all interconnected.
As an example, see "How Wolves Changed Rivers":
https://news.ycombinator.com/item?id=8448929
Now, imagine the impact of a million species being wiped from the earth.
https://news.ycombinator.com/item?id=8448929
Now, imagine the impact of a million species being wiped from the earth.
What issue do u see ?
Well, if anything the only time I concern about non-human well being is because it affecting human who care about them.
Most of natural plants will not grow fruit and seeds. Plants will die and so will animals that depend on them.