Nobody really knows, and it's too late to do anything real about it. Fun times.
Your comment sounds like on of the stages of the "four stage strategy" from Yes Minister:
https://www.youtube.com/watch?v=nSXIetP5iak
originally about why the UK doesn't help foreign nations in an inconvenient crisis.
My understanding is that very little of what we do now would have any effect on what happens in a decade. Maybe in three.
It truly was a genius show.
It is a question of how much damage.
And that point is where positive feedback loops dominate at which point it is very much boolean, habitable by humans or not.
But we do not know where that threshold is.
And we may have already passed it.
We just pretend there isn't a real threshold because scientists can't tell us exactly where it is yet so we might as well just keep doing what we've been doing for another 20 years... like we've been using as an excuse for the last 40.
It's hard to argue that there are no bad feedback loops once temperature gets higher. We know of several huge methane stores that are temperature dependent, we know how ice and clouds work as temperature rises, etc. We're gambling 90-100% of humanity on the critical points not being reachable.
It's heartbreaking. We had everything and we pissed it away.
Because there's certainly *not* scientific consensus that there are negative (technical sense) feedback loops that continue to stabilize the climate (well enough) far away from the steady state climate and a lot of good reason to think that they will fail to keep up.
You are wrong, it's not too late to change how we behave regarding climate and such way of thinking is unlikely to induce the required actions.
It's: "we already fucked up, can we _please_ stop making these awful gambles before we're inevitably all dead?"