Hmm, the way I see it it's not really about saving land for animals coz they're cute and we take pity on them. That, however, is the kind of feel I get from your topic. ('Picturesque world'? - I beg your pardon?!) In a way, nobody should have to worry, as the more of the animal species becomes extinct the more definitely the extinction of humans will be impending. That's because the ecosystem will collapse, as a result of the breakdown of a very intricate and (up to this day at least!) finely tuned balance between all organic things. Looking at both human history and human way of behaviour, I tend to assume that disaster will eventually globally come for people, and nature will resume its course. I'd say, be reassured and free from worries because humans will disappear, but organic life won't. Also be reassured and free from worries because 1. we cannot live without the planet, but 2. the planet can live without us. Humans aren't really that important, and, in the long run, don't have that much impact, whatever they do.