Doesn't really affect me at all; this is simply why you need to diversify beyond the S&P. The Russell 2000 took 4 years to recover--still significant, but not anywhere close to doomsday. And even the "lost decade" is a pretty hyped-up concept. To get it, it is measured from the absolute peak of the market, a time at which exactly nobody made a single lump sum investment of their entire 'stache. Since nobody invested everything at the peak, plenty of people made some money during this time.
My personal stache grew 10x during this lost decade. While I was still saving during this time, it was also a period where my investment growth outweighed my contributions.
Getting specific to the article, price to sales is about the last metric I would bother with. I invest for a share of earnings. Everything else I have said has been said before in reference to P/E, but trying to find a "scary" chart by cherry-picking a metric shows me how weak the premise was. The editorial meeting assignment must have been "Find me some scary metric, so we can get people clicking!"