As butterflies pass through a metamorphosis, markets do as well. On my futures charts its very clear that the wedge has given way to a channel and I think this is true for the SPX as well.
Though sloping down, its been profitable, thus far, to sell tops and buy bottoms. The last days are perfect examples.
The market is a historian of the first order and should the ES_F continue its fall we will likely visit 2017, 2016, 12ish, 10ish, 2005 and 1999 depending if we pass through the 200 DMA.
Again, these are battle tested ES_F numbers; to get to the SPX equivalent, add 3 to 4 points.