Low, flat volume since Spring '16

Something I just noticed...That peak and valley sin wave pattern stopped. Now just looks like it's in a small decline. In my experience, dying volume for a trend indicates a coming reversal - which means maybe some retracement back to $800 before next leg up?

With the low volume, I'm not convinced of a stronger parabolic move upwards. Why so much less volume in these price ranges than in 2013-14?

I understand there is constantly lessening supply, and a lot of holders, but the volume disparity is too huge for me to believe in more green the next few months.