> And given that biodiversity is what got us to where we are

Mass extinctions also is what got us to where we are. If dinosaurs were still around when humans started to evolve, it might have been a Bad Thing.

Many species are supposed to go extinct, all the time. That's is how nature and evolution works. If we become extinct, then it paves the way for human++. This is neither good nor bad, it's just how life has evolved for billions of years. I think if we try to stop this and maintain status quo, that is ethically and morally wrong.