Humans will most definitely be the cause of human extinction on planet Earth. I would put my money on Homo sapiens not making it another million years on the surface of the planet.
Homo sapiens reached anatomical modernity about 200,000 years ago and began to exhibit behavioral modernity around 50,000 years ago.
I suspect that our descendants 1,000,000 years from now wouldn't consider themselves Homo sapiens- primitive, brutish creatures. (Consider how we feel about our ancestors from as recently as 50,000 years ago.)
Actually we can relate very well with the concerns of people from a few thousands years ago. Writings from ancient Rome, from ancient Greece are still very contemporary in many, many ways.
A million years is too far. Even if it doesn't happen by then, we are going to run out of energy, get killed by super bugs or hit by a asteroid.
The threat of human driven human extinction is more on the lines of a mutually assured destruction, weaponized nanotechnology or genetic engineering, irreversible climate conditions, over population of the planet etc.
I suspect that our descendants 1,000,000 years from now wouldn't consider themselves Homo sapiens- primitive, brutish creatures. (Consider how we feel about our ancestors from as recently as 50,000 years ago.)