I think the future is very grim for biodiversity. Even if we stopped destroying habitats tomorrow, many larger animals are already living in small, isolated pockets surrounded by roads, farms, and industry. Meanwhile, plants and smaller animals face intense competition from invasive species - often brought in by accident thanks to the constant flow of goods around the globe. We're probably headed for a pretty homogeneous global ecology - where "economically significant" or highly adaptable plants and animals thrive, while the others are relegated to zoos, national parks, or extinction.