IF, the were to break, the SPX could fall to 2550, which is the 2009 BullRun TrendLine.
SPX has already broken thru the Dec18 low TrendLine and has fallen off ATH at 3020 and is just above the 200day MA at 2800.
I think the market will fall down through wedge or rectangle soon. Yes, 2550 could be a target to aim for. A DCF valuation using 4.5% growth rate in earnings and 8.2% discount rate gives a S&P500 valuation of 2700. It could be lower in a recessionary situation. Be careful of volume on TV charts, it represents CFDs traded. Picture could be different for actual shares traded or futures traded.