The most dangerous innovation in this regard is advances in brain scanning is it could make it trivially easy to find the resistance. But robots and AI are factors too. If the rich don't need the labor of the poor it will certainly shift the balance of power.
What terrifies me more than the idea of brain scanning that works is the (IMO more likely) deployment of "brain scanning" that doesn't work (but is used anyway) and creating a 21st century witch hunt.
AI is very impressive, but people are getting so used to it performing magic that they believe it can do anything while preserving the veneer of objectivity that algorithms earned in the pre-ML days.
[0]https://www.reddit.com/r/ChatGPT/comments/1354ju1/scientists...
As long as the elite still need other lower-class humans, e.g. chauffeurs, nannies and cooks, or security, the revolution can still get to them.
If the chaos so many rich preppers are gearing for comes to pass - their wealth won't protect them. As this[0] article points out: in an apocalypse, there will be nothing stopping their armed ex-special-forces security guards from taking over their New Zealand compounds and throwing them out - or worse. Their status as elites is preserved by the very institutions they are undermining.
0. https://www.theguardian.com/news/2022/sep/04/super-rich-prep...
Isn’t this the point of the fears of AI and automation? A truly sovereign individual, singular, against all others.
You can claim it's not right, but there's right and there's the reality of human nature. Push the populace hard enough they WILL push back.