His argument isn’t as much that there won’t be enough units for everyone as that #Bitcoin isn’t an ideal money compared to gold because the gold supply is able to expand with the productive economy (New gold deposits are found, more effective mining techniques, etc.). Sure gold won’t work in a digital economy, but another crypto that better mimics gold would be better than #Bitcoin as it exists today.

A simplified argument would be that if, under the global #Bitcoin standard, I make one sandwich and sell it and get 20 sats, then economic production doubles and now a sandwich is worth 10 sats, then I have two sandwiches worth of value even though I only created one sandwich. He’s saying that ideally the money supply should double with the economy in that scenario to be an accurate measurement of the value I created.