There's a related calculation you can do -- what percent of your net worth is your employability? Take your salary, divide by 0.05 (or multiply by 20) -- if you had that much additional wealth earning 5%, you could replace your job's income.

For most people their ability to earn is by far their largest asset. You can kind of get a feel for how difficult it is to bootstrap into generational wealth if you think about the math -- it takes time to replace that earnings portion of your own balance sheet, and even more to well replace it; a lot has to go right in the interim.