A week's not going to make that much difference.
Considering EVERY day this year has been a huge drop (except one flat day) and foreign markets are down another 3-5% overnight, swift action could save TRILLIONS of dollars in stock value. The markets have already lost about 10% this year, more than wiping out last years gains. Another week, will be another 5-10% decline, minimum. The Fed needs to act NOW.