To be fair, some improvements have been made, even at the feet of these giants, driven by government action and populist initiatives. This has been at the cost of concentration and increases in pollution and poverty in the poorest nations. The future looks bleak today, as the divide grows and progressive progress has all but halted.
I don't know what great inventions and technological leaps we are going to see in 2030, 2040, or 2050, but what I do know is that the benefits and wealth from them will be captured by the same class that is capturing everything today.
The ruling class will bring the violence soon enough.
Can't happen. As soon as significantly many people stop working, the remaining will be offered larger salaries to keep working. That is why revolution against the modern power structure is so hard: because there are economic incentives against revolution for the working class.