McAfee's projections seem similar to those as described by @PlanB at Twitter: https://twitter.com/100trillionusd

The PlanB theory revolves around the 'Stock to Flow' method. You can find the theory here: https://medium.com/@100trillionUSD/modeling-bitcoins-value-with-scarcity-91fa0fc03e25

A live chart can be found here: https://digitalik.net/btc/

The core premise of the Stock to Flow theory is that Bitcoin's value revolves around its scarcity. The scarcer the flow, the higher the price. With each halving, the flow (Bitcoins mined per block) becomes scarcer.
Information on the next halving can be found here:
https://www.thehalvening.com/
and
https://www.bitcoinblockhalf.com/

The essence of this means that we could/should expect a major price rise after the price halving, somewhere within Q3 2020 - Q2 2021. A failure would start to disprove the SF pricing theory.