Alternative view - it’s not that critical really.
I could share a couple of other podcasts / posts to state (according to Morningstar & Vanguard - sure, you could argue that the latter are biased):
- 30% of global fund assets (mutual and ETF) are indexed (i.e. assets being held)
- however only 5% of all the trading activities are executed by funds that do indexing – i.e. active price discovery is still very strong
- and only 10% of all investable securities (stocks, bonds, REIT etc.) in the world are in those index-tracking funds
And Mr. Fama said that no need to worry about price discovery before it reaches 90%. 
So, keep calm and index. 