Millennial investors first gravitated to the use of robo-advisors to guide their investment choices, but now their older, wealthier parents will increasingly turn to robo-advisors too.

That's the prediction of Scott Schneider, president of Zacks Advantage, who expects experienced weatlh managers will begin using robo-advisors as a way to lower fees.

Schneider also says the upcoming Department of Labor Fidicuciary Rule will create a major shift in investment trends next year.

That rule, which takes affect in April 2017, requires that all investment fees are completely transparent, causing a shift toward the significantly lower fees offered by robo-advisors.