What's the breaking point?

[busker]

The Earth is dying as the first world continues to rape and plunder the third. 

Actually, the world's biggest consumer of energy and materials is China, hardly a first world country. And no, most of what China produces goes back into Chinese infrastructure.
Developing countries benefit hugely from trade with the developed world. An example is Indonesia, which relies on China, and to a lesser extent, India, then to an even lesser extent, the rest of the world, for selling its coal, nickel, and palm oil to.

Nothing short of violent revolution against the capitalist class can save it. There will be a period of even more acute suffering, but it won't be forever and at least the masses will have their soul back in that fight, whereas before their entire lives revolved around capital. 

The 'masses' care about their families, and sending their kids to college. Only jobless college students, their tuition being paid by their parents, or 20 somethings having their lives being subsidised by their parents again, dream of the coming revolution.
Those who are actually poor are trying everyday to get out of that cycle. Revolution is the last thing on their minds. 

Change is painful. Confronting traumas (such as the apocalyptic event of colonialism) is painful, otherwise what would we be confronting?

Colonialism was a blessing in many countries, for a variety of reasons.
In some others, it wasn't a blessing at all, but hardly 'traumatic' except for the generation that actually suffered.


You might want the US to go, but it won't. Societies don't disappear because some people have indigestion. Instead, if the complaints get too bothersome, the complainants are swatted away like flies. Only, in western democracies, you're given a far longer rope than in the developing world or, indeed, the workers' paradise of China.
The US does need to reform, being the only developed country with such a huge, uneducated, base of religious bigots. It will take one more generation for things to get better in that regard.

---

And FFS, the earth is not dying.
Climate change will make it harder for humans to exist as they do today. It will reignite the wars of thousands of years ago, with nations battling for water resources, and land (as their own goes under the sea). It will probably be very bad for future generations. But the earth is not a living being. It can't 'die'.