New ones will appear eventually. Though of course you and I won’t get to see them, because it will take a few hundred thousand years or more.

If people are concerned about species extinction’s impact to humans, that is a defensible position. Most people seem to act like it isn’t about human enjoyment though, as if there is some intrinsic value to species count even if humans were out of the picture. The time it will take to re-diversify is the blink of an eye in geologic terms.

There is inherent value to a large species count. Exaggerate the situation and say the only animals left in the world were dogs, cats and cows. Extrapolate that same sense of massive loss to this situation. If you don’t care then I guess there isn’t anything else to say to you but recognize that the loss of species diversity causes many people to feel an immense sense of loss, comparable to say large scale genocide of a human ethnic population.