I just don't think its that bad. I can see us going the way of the dodo but not all life on Earth. I think the planets tougher than that. Just an opinion though.
The problem with an assumption that the biosphere will survive is that there has to be enough plants, animals and bacteria to maintain a self-regulating biosphere....and no one is certain what that level is which would be needed to keep the Earth from becoming too hot to sustain life.
A fascinating point from Gaia Theory that I wasn't aware of previously: the Earth would become too hot to support life if gaia/or the biosphere wasn't self-regulating. What this meant in the early stages in the history of life on Earth was that the first living organisms had to maximize the greenhouse effect 3.5 or 4 billion years ago, because as the Earth's surface was cooling, the Sun was only giving off about 70% of it's present energy. This meant that liquid water would soon freeze and make life much less abundant and likely to vanish. So, those early archaea bacteria changed the atmosphere to produce more methane and less CO2....methane being at least 25% as potent a greenhouse gas, this strong greenhouse effect kept most of the oceans from icing over...most of the time! There are likely several times when the planet turned into Snowball Earth, and things grew dormant for awhile until the next thaw.
About 2 billion years ago, the Sun was pumping out enough energy so that the Earth was in a Goldilocks Zone -- where energy from the Sun was just right for maintaining liquid water without any need to regulate the atmosphere. As a conjecture, James Lovelock speculates that the catastrophe and mass extinction that resulted from the first oxygen-producing bacteria, did not doom all life because no regulating was required.
But, since that time, as the Sun has grown increasingly stronger, the Earth's biosphere has to work to reduce CO2 levels when they get too high, to prevent a runaway greenhouse effect. This has occurred several times from long periods of vulcanism -- especially during the periods when the Earth's continental plates are either splitting apart or crashing into each other. A long period of excessive volcanic activity -- such as 250 million years ago -- kills off a lot of plant and animal life, straining the capacity of the biosphere to get CO2 and methane levels back down to manageable levels and allow life to flourish again.
But the present Anthropocene Age is the first time in the planet's history that one of its organisms has managed to destroy the balance at rates of increase that were unprecedented in Earth history. And, we still have our foot on the gas pedal -- if you've noticed the shredding of any efforts to reduce CO2 emissions at Durban, in spite of the new reports that we are actually increasing carbon production....and, ofcourse, there is also clear evidence that we have set positive feedback cycles in motion -- especially in the Arctic -- which will keep adding more CO2 and methane to the atmosphere for years to come....even if we're all dead!
The question of whether the biosphere will be able to recover from all of the impacts we have had on it is still up in the air. The Sun is putting more pressure on the planet, and a living biosphere will have to work even harder to remove all of the greenhouse gases added over the next 100,000 years or so....and if there is not enough life to regenerate a biosphere strong enough to scrub the atmosphere, then the Earth will end up as a dead planet.