To be clear, your article assumes that Bitcoin's market cap (about 210 trillion after all BTC has been distributed, or lower if you account for lost coins) will become about the same as all money that exists in the whole world including savings (excluding dividends).  That would require the total collapse of all forms of fiat money and of all other cryptocurrencies.  Are you really saying that's a reasonable scenario to expect for a currency currently handling only a few hundred thousand transactions per day?