Staying employed and slowly building your wealth is not a riskless proposition. Past 20 years have been very nice to the tech sector and to equities in general. What are you going to say when your employer suddenly collapses and takes your pension/stock wealth with it (Enron, Bear Stearns etc)? Even more extreme -- what if the whole economic cycle reverses, the currency devalues and inflation eats up your savings? Ha…
I'm sure it's possible to instead put your 401k and IRA money into a diversified collection of ETFs and bonds and such and still end up broke, but it hasn't happened yet, and if it does, our entire country is in a very bad place.