Good article.

He warned the flood of millennial money into index funds and ETFs was fueling unsustainable valuations and putting the stock market in a precarious position. "Parabolas don't resolve sideways," he said.

Although this:

"People are missing the boat," he added, noting that he expects the best active managers to consistently trounce the market.

Here's my guess: Peter Lynch defines "the best active investors" as "the ones who trounce the market" and therefore the statement is non-falsifiable.