(Which would get you to three million by the way)
I suppose this is a matter of your definition of "plenty of people".
[0] https://statisticalatlas.com/United-States/Household-Income
[1] https://www.quora.com/How-many-people-earn-200-000+-per-year...
That time period was one of great prosperity that won't be repeated. Market returns were higher; most of the low hanging fruit has been plucked, and you can expect ~5% in equities returns. Its going to take far more capital now to get the same returns your grandparents had, which is why you see capital chasing returns across the world.
https://www.cnbc.com/2017/05/07/get-ready-for-dramatically-l...
"The leaders of Vanguard Group, overseers of some $4 trillion in client assets, have been advising investors to expect a typical 60 percent stocks/40 percent bonds portfolio to deliver two- to- three percentage points less in nominal annual returns than its long-term norm. (Since 1926, such an asset mix has returned better than 8.5 percent annualized.)"
"Other forecasts are even less generous. Research Affiliates, a quantitative and "smart beta" fund manager, projects that U.S. stocks might only offer one percent a year for the next decade, after inflation. This is based largely on the so-called Shiller P/E, a ratio of the S&P 500 index to its trailing ten-year average earnings, which is now above 29 and higher than any period aside from the run-up to the 1929 and 2000 market peaks."
"And with risk-free 10-year government debt yielding a skimpy 2.3 percent in the U.S. and far less elsewhere, all other financial assets have repriced for skimpier future returns as well."
The example they provide
> Farmer spends $50 on tractor repair from mechanic. Mechanic buys $40 of corn from farmer. Mechanic spends $10 on barn cats from farmer.
does not involve stuff made abroad, massive corporations with economies of scale eliminating the middleman, or foreign-owned entities.
Most of that velocity will end up in China invested into another skyscraper ghost town, a massive infrastructure project or a cryptocurrency mining farm.
I don't see why it can't be a two-pronged approach with both higher income taxes and wealth taxes. It's what was done in the 1950's, and there was still plenty of wealth then.