I don't know about overpowering us so much. I think we will accidentally wipe ourselves out long before any other species has the opportunity to become "top dog." Not something evil like we make our planet uninhabitable through nuclear war or anything, but something stoooopid.
Like collectively forget to wash our hands at the precise moment an otherwise harmless bacterium evolves a lethal mechanism. Then we all catch it within 6 hours of it having done so and end the human race.