You're probably right, and we may see 2100 again. But I disagree that today was the day. All terrorist attacks and scares have been bought for the past 2 years. Always. No surprize that this one was bought too. Of course this event has messed up the trend for a few days and the noise has to die down before the trend resumes. But we had a nice little downtrend going even before that. However as this noise dies down, I think that the event itself will have an overall negative effect on the market going forward. Just another detail to depress the psychology of the market.
Tomorrow is the employment report. If the news isn't good, then it will be the real test of how the market acts.