What made me chuckle seeing this post first time was that it mentioned a time frame as well as a bottom value for S&P500. I just hope not many people jumped on any predictions posted on a forum (many posts like this are posted every day on many forums). The only thing to trust and get a signal from is the market itself.

I learnt my lesson long back that you cannot time the market. You loose more money making opportunities sitting on the sides waiting for the melt down than what you make if you actually catch the bottom (once in blue moon). If you could time the market, it means you can beat the market. However, there is a reason that the best of fund managers with the best of tools available, fail to time the markets correctly and hence fail to beat it consistently.