It seems you are making an argument from apathy - since there's nothing we can do about the rich, we shouldn't do anything?
Because we can certainly reduce the number of complex workarounds - which were deliberately introduced to allow the rich to have those workarounds. We can increase the taxation rate for the highest tax bracket, like the 90% it once was. And we can increase the estate tax.
The current federal estate tax has an exemption of $5 million. Just how many middle class families do you think would be unable to send their kids to college if the estate tax rate after the first $5 million was increased? For that matter, how many middle class families would be unable to send their kids to college of the exemption were lowered to $2 million? Because $2 million seems like a lot to me.
Poorer people will receive no windfall in life. Since you want people to have windfall ... how do you want to support poor people? How should the children of the poor go to college or whatever?
Because otherwise what you write sounds like a standard wedge argument - get the middle class to fear for losing what little they have, in order so the rich benefit even more, while the poor get left out.
Higher pay via stronger union rights (repeal Taft-Hartley now!), universal college education. These help give your desired economic windfall for the middle class and my desired windfall for the less well off.
The rich and the children of the rich will still be rich.