According to XTF data, there are now 2,153 U.S.-listed ETFs with $3.5 trillion in assets under management and an average expense ratio of 0.59%. The cheapest ETFs on the block now come with a dirt low price of 0.03%.

Furthermore, Johnson also pointed to a growing trend to build full investment portfolio solutions with targeted ETF plays, pointing to the growth in the ETF strategist landscape and ETF managed portfolios that are comprised of ETFs.

“A movement away from sort of à la carte sales of slice of the pie – my S&P 500 index fund is better than your S&P 500 index fund – and a pivoting towards selling whole pies,” Johnson said.

For more ETF-related commentary from Tom Lydon and other industry experts, visit our video category.