> [...] dividing the total US income by the number of workers [...]
So, for that $90k figure to be attainable, you need those who aren't "workers" not to get any of this money. Which means that becoming a "worker" will suddenly mean getting an extra $90k/year, whatever the job. Which means that there will almost certainly suddenly be a lot more "workers". Which means you can't manage $90k/year after all.
Also: Your system relies on taking away a great deal of money from rich people in order to give it to a larger number of people who would otherwise be much less well off. I have no problem at all with this as a general approach, but the more you do it the harder those rich people are going to try to avoid paying; and rich people can generally afford a lot of expert assistance with not paying, arrange for a great deal of lobbying to get the rules changed, etc. -- which means that you probably can't get nearly as much money out of them as just looking at their salaries suggests. For instance, duh, suppose that every employer that currently pays anyone $(90k+x)/year decides to pay them, say, $(90k+0.1x)/year. Suddenly 90% of that tax revenue has gone. Whoops, everyone else's annual salary is now $9k/year.
Also: as others have pointed out, it is ... not obvious ... that being given a low number in some official government ranking would be as strong a motivator as actually getting rich. Yes, one reason why people want to get rich is because wealth brings high status. But there is some reason to think that they also want to get rich because wealth brings large houses, good food, nice holidays, fast cars, and all the other stuff that one can buy if one has enough money.