One big problem that none of you are taking into account with regard to volatility is that there is "good" and "bad" volatility. By this, I mean, throuout the '90's volatility may have been low in many cases BUT the likelyhood that a down day would be followed by another down day was very high. The same persistence for successive up days. Even in the high volatilty of the late '90's-2002, that ''persistence'' existed. It is NOT the case today, and this is why most hedgies/funds are all having a hard time trading this market.
Today, an up day is likely followed by a down day and a big range day is likely followed by a narrow range day and so on. Just very frustrating to trade.