[HarHarVeryFunny]

On an evolutionary timescale it's a bit early to call humans a success. We only diverged from other apes about 5 million years ago, and have existed in modern human form for much less. Mitochondrial Eve lived only 100-200K years ago.

In the last few hundred years since industrialization we've been destroying our own environment - the one we'd previously adapted to - at a rather remarkable rate, an "experiment" that is still playing out. Will it turn out to be successful, or will we end up modifying the environment so much (or just fail to evolve quickly enough to adapt to changes outside of our control) that in another million years we'll all be gone?

We'll certainly not last forever, even if we manage to have a run as long as the dinosaurs. Whether it's climate change, disease, or some unforeseen change in our fortunes, eventually we'll either go extinct or branch off into a bunch of other species that would be unrecognizable to ourselves.