Just because some consumers take cash out when they refinance doesn't necessarily mean "the average" consumer does. I've refinanced probably 4 times in the last 7 years, and have never taken a penny of equity out of the house. Some of the 45% who do take cash out may use the money for home improvements, which could put that cash right back into the equity of their home. Others who take cash out may only take a little out relative to their equity.
I'd like to see statistics showing the historical debt/equity ratio for homeowners. Anybody know whether such a statistic is available?