My reply was tongue-in-cheek. Just pointing back to the ridiculous notion in the original post that an xx% decline in the housing index predicts an xx% decline in S&P 500.
My (near-term) bet is that S&P 500 tests lows in the 1200-1250 range over the next 1-3 months, then rallies at least once more before the $h!t hits the fan.