It was pointed out that participation is dropping in this rally according to the $VLE. I haven't used this
in a long time. Looking over the last year, whenever it diverged with a new price high, SPX went on to
add another 100-300 points before correcting, this latest case was Oct. through Jan, for an additional around 300 points. So, this might fit with a March or April top, I don't think we drop more than 5% though.