Thomas Picketty does indeed argue in Capital in the 21st Century that the post World War 2 period is indeed an exception in terms of inequality being lower while historically it is not, and it is reverting back to the mean of there being more inequality these days, yet people bemoan the idea of not being able to live off a single job when in reality that was never guaranteed.
Much as we'd like that to be true ideally, does it happen (in terms of inequality reducing)? I see no evidence of that, it ebbs and flows in various time periods and civilizations. One can try to resist that reversion to the mean but they'd historically be proven wrong.
For a start by not tearing down the systems that kept inequality in check in the past. Like union membership or banking regulation etc. just to name some examples.
