Really not surprising nor frightening.
What percentage of the total population is:
1) over 70-75 and thus only in bonds or a CD ladder or something
2) Under 25 and thus haven't really even begun saving
3) Are basically on government assistance, disabled, or work bottom feeding jobs or really basic labor jobs where they are never going to have a work 401k or any real retirement plan... for these people social security is probably enough to maintain the level of lifestyle they were used to.
4) independently wealthy and thus don't need the stock market
I'm not sure what percentage that is... but it's got to be at least 33% right there.
Now, are there still a decent percentage of people that you probably know at your work that for irrational reasons or otherwise think that the stock market is a total rigged casino and that you'll just lose money there. I have a very good employee that's been with the company over 30 years and is going to have a garbage retirement because she has only put away like 3-5% of salary and invests in 100% money market.... therefore is like 50 y.o. and doesn't even have 150k in her 401k.. and i know she's not utilizing a roth ira.
Look, I think the market has some very rigged components of it... but in a no yield environment unless you're going to become a savvy real estate investor or other type of investor... the stock market is the only game in town... and I'm happy to play it.
So I really don't think numbers like this are as damning as you think they may be.
They sound really bad to the average FBG who couldn't imagine not having a retirement portfolio with a reasonable stock allocation for their age... but we just don't think like the bottom half of society... this message board certainly has to have a tilt towards more well read successful people overall.