Yeah, I doubt industrial society is going to survive for another 100 years. I'd be surprised if things don't go to shit in the next 20, and that's not even accounting for some sort of "black swan" event triggered by a feedback loop or something like that, that suddenly kicks off a speedrun to turn Earth into Venus.

We're fucked, and we'd be fucked even if humanity went carbon negative starting right now. While the human race will likely be fine, this current lifestyle and economic system we've got in most of the developed world will go tits up and billions will end up dying, if not from the direct effects of climate change then eg. social instability, war, disease, famine. While we could still make the future slightly less bad for ourselves, it's simply not profitable and there's so much inertia in global capitalism that things won't change without fantastic amounts of violence and social upheaval, and I doubt the next change will be for the better considering how popular far right and conservative parties are in many places around the world right now. They're gleefully making things worse and then blaming leftists / black people / atheists / science / The Gays / etc

The guards those billionaires hire will be in good shape, especially after they kill the billionaires.