From the stats I’m reading, it appears that as more people enter the workforce, there will, of course, be more millionaires going forward, but, proportionately, the percentage of that population will remain about the same–which is, amazingly, quite low.
On the flip side, there will also be a much higher percentage of people living paycheck to paycheck (for reasons too numerous to mention), and working longer–because they have to–with the net result being a diminishing quality of life for more and more people as each generation enters their 50’s and 60’s–whether they want to retire or not.