If the monetary system collapses within 10 years and BTC ever reaches 10 million dollars, he will have a net worth of 1 400 000 000 000 USD. Aside from his other assets that I'm not aware of.
Why would monetary system collapse? This didn't happen in the last 50 years. The people who are waiting for that to happen - the goldbugs, libertarians, marxists, bitcoin maximalists - they all sound like a doomsday cult.
Also, the idea that Bitcoin will benefit from a global economic disaster has been challenged. Inflation is high right now, yet Bitcoin is not in a bull market. It was in a full-swing bear market in the last year when inflation was the largest.