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Well, it depends how much 1 million dollar will still be worth. hope there won't be any African situations with inflation so high 1 M = 1 USD now

Exactly! He is banking on the fact that there will be hyperinflation in the fiat world by the end of 2020. Very likely that the combined effect of Bitcoin's deflation with fiat inflation will allow his prediction to come true! In the future I can see $100 having the purchasing power of a $20 bill right now.