One of the things Marx got right was to analyze society in terms of economic interests, and realizing that there was an intermediate class whose interests are more linked to that of the upper class than to the interests of the masses.

In feudal times, kings and barons needed lesser gentry to carry out their plans. "Billionaires" likewise need armies of professionals to run their organizations. This group "works for a living," but that's a superficial distinction. In reality, those peoples' financial interests are strongly linked to the interests of the billionaires. There's a lot of people who "work for a living" that sent their kids to college by helping paper up deals that moved factories and jobs to China. The fact that those lawyers and accountants and bankers also "work for a living" was only a superficial similarity they shared with the factory workers whose jobs were outsourced. What dominated was the material interest--one group had skills that enabled them to benefit from globalization. And another group lacked those skills and suffered from globalization. You'll see the same from AI.

Your "class solidarity" has had the opposite effect of what you probably intend. The more the upper middle class started seeing themselves as "part of the 99%," the more they diluted the mission of organizations that advocate for working class interests.

Perhaps incentives among workers will align better as those lawyers, accountants, bankers and other billionaire-supporting professionals themselves also start getting discarded by the billionaires in favor of AI and automation. The material interest alignment will evaporate the second the billionaires don't need those professionals.