I'm sorry to hear about your cousin's loss, but they either did something really stupid (like panic selling at the bottom) or were in some very risky investments. Any basic stock portfolio (index-based or whole-market based) has fully recovered from the 2008 crash, plus a healthy growth. In fact, we have been in one of the best bull markets in history for almost 7 years now.
If anyone has a 401k that hasn't recovered in this fantastic market, they need to fire their advisor! And if it was self-managed, they have no one to blame but themselves. Sorry to be blunt, but I am so tired of hearing how someone's portfolio hasn't recovered from the "Great Recession" -- the numbers and facts only point to mis-management if that is the case.
Kurt
I agree with you 100& your statement if factual just asked any money advisor.