> This is the equivalent of picking and choosing words in an article and making up your own sentences.
I would appreciate it if you at least presumed that I tried to think about the scenario, rather than made up fantasies to live in.
The core idea I am exploring is that quality of life is seemingly unrelated to the number of species in totality within a continent.
The strongest argument usually made for saving endangered species is that if a niche goes unfilled, the entire ecosystem is damaged and in the worst case may suffer from localized collapse. However, if you look at entire continents, multiple species exist within the same niche, merely separated from inter-breeding by distance, so no niches go unfilled (i.e. wipe out the wolves, and the foxes will step up to eat the possums).
England once had lions, and when they were gone other species filled their niche, and human life went on.