Let's be honest, economical success is nothing but an arbitrary concept stemming from the fact that we believe some people have more than others, based on the rules of society.
Now if I were to make an educated guess, this whole concept may at most work for another fifty years.
We got robots, AI, and general automatization. Those things are going to replace like 90-95% of the working force. Now the question remains, what is going to happen to those people? Even if most of the power lies with the rich, I doubt it's not going to be all that easy to kill off that many people. Therefore, society either finds a solution (which I currently worry won't be happening), or we'll eventually get a severe societal inequality crisis, followed by a rather bloody rebellion. As of now, the concept of general manipulation, to set the poor up against the poorer still works, but once even the dumbest idiot notices that jobs to make a living no longer exist, then maybe at this point things will change. Either that or the majority just accepts it's going to get wiped out, which I doubt will happen so easily.
So yeah, without a societal solution, one day the hashtag "kill the rich" is going to become popular.
As for me, I hope I'll live through this.