One part in the article that bothered me was the notion that older workers refusing to leave will reduce opportunities for younger workers.
It was a similar situation (lots of young men needing jobs currently held by older workers) that led to the formation of Social Security, if I recall correctly. I wonder what steps the government will take if this situation does play out this way.
And it's worth noting that just because people aren't optimistic doesn't mean those opinions are necessarily grounded in fact--just look at all those articles saying you'll need 80 to 100% of your pre-retirement income, as one example.
We on this forum know that's not true, but many people are swallowing it hook, line, and sinker, thus distorting their perceptions of what their retirement will really be like. Once they get there, perhaps they'll realize that, despite their pessimism, they may not be in as bad a shape as they thought they were.
Which would render all of the speculations in the linked article (however interesting) moot.