"we are still the only species who have a chance of making it off the planet"
For now. Personally, I hope that, if (and only if) we humans do destroy ourselves, enough life remains for something else to evolve and have a shot.
It will be much harder if it's not us. We've taken a lot of the easy resources, and many of them won't come back before the sun eats the Earth. (Some will, many won't.) Hard to build a technological civilization with no copper deposits left. It can (probably) be done, but it will be orders of magnitude slower.
No matter what how much damage we do to this planet, we are still the only species who have a chance of making it off the planet before it smashes into the sun.
What about animals used in farming, plants used in agriculture, pets, useful bacteria etc.? I'm quite sure they will not be left behind.
You can say what you want about us and how beautiful nature is, but in the end there are thousand of species that can fly but only one that can play the guitar, thousands of species that can walk, but only one that invented the car, a million species that breath but only one that build a ship to sail under the waters...
The point of all this is that the human species really is something special.