The system promoted by this article doesn’t hold up in the long run according to the very interesting study discussed in this video:

Also, as others here have pointed out here, as more and more money is accumulated in ETFs that focus on the large companies that most funds hold; this strategy becomes unstable and a hazard to the general economy in terms of efficient allocation of resources. If ETF investing simply becomes a bet on the sustainability of central bank blown asset bubbles then the ETF losses when the bubble pops will be much much larger than the average investor ever expected. John Q Public expects ETFs to keep him safe when in actuality they could be setting him up for the mother of all wealth destruction experiences.