When VXO trends up for two years, it typically sees a large move higher on the third year. An outsized move in volatility is coming due in the year 2020.
A test of the 1987 trendline would take VXO up to approximately 65, and surpass all peaks since 2008.
Yearly Chart
VIX typically tops out 5 points less then VXO at volatility peaks giving a VIX target of 60.
Yearly Chart