I think you'll find that AAII members are probably the most educated of non-professionals (if they're paying attention to AAII makes available to them), and they know that the thing to do--so far--has been to ignore the naysayers and to be flat out long the market.
But, once again, this is my canary in the coal mine chart:
https://research.stlouisfed.org/fred2/graph/?graph_id=147069&category_id=
https://research.stlouisfed.org/fred2/graph/?graph_id=153641&category_id=
And what you will see is that the market trails corporate profits by about 2 years (except in a crash), and it takes a decline in profits of more than 15% for the market to notice (in 2007-2009 SP500 profits fell by a factor of more than 10).
I'm not sure it's time for long term investors to sell yet. It's a little different for people like me who can profitably trade and institutional investors that are indeed timing the market (this IS a trading range market and timing at this point is how you make returns).
But the bulls had better get some oxygen to that poor canary, because the clock is ticking. My charts basically say that they have 1 year to turn profits back up or the game WILL be over. The problem is that we need help from the central bankers to pull this off:
http://www.businessinsider.com/corporate-profit-recession-indicator-2016-2
And when Lazlo Birinyi gets nervous, I pay attention:
http://www.bloomberg.com/news/articles/2016-01-22/birinyi-more-worried-about-markets-now-than-any-time-since-2009