Interesting reading. Took a look at my company's plan at the end of last year and how everyone is investing. Not a lot of bogleheads.
Active management equity or balanced funds: 47.4%
Target date funds (~.51% expense ratio): 23.3%
Equity index funds(S&P 500, S&P 400, Russel 2000): 9.8%
Money market fund: 9.0%
Bond funds (Pimco total return & Vanguard intermediate treasuries): 5.7%
Company stock (likely lower now since stock is way down): 1.4%
Last but not least.....401k loans: 3.4%
That's over $15 million borrowed from 401k accounts. Oy Vey!