I disagree with this assessment. Supply side economics sold the working class down the river and the damage was not apparent until later on. Neither neoliberal approach has worked or is working, and many economic ailments are slow developing so the damage may not be apparent at all early on. But the middle class is being gutted, the working class is struggling and growing in number and percentage. If AI is even half as disruptive as it is surmised to be, this will be catastrophic to both groups.
Both systems grow income inequality astronomically and that plus the debt are the two biggest economic challenges we face today.
When 50-60% of the population struggles or is unable to make ends meet, that is an untenable situation. And it is no wonder why NYC just nominated a democratic socialist to be mayor in light of this. If these economic trends hold, Mamdani will be the first of many to come and there will be a large socialist movement in the US.