Accoring to recent 2021 study there are 56 million millionaires in the world, so that means each millionaire could only have 37.5% of a Bitcoin, assuming all 21 million Bitcoin still exist. Most estimates suggest up to 5 million coins may have been forever lost in the early days… which means if you can get your hands on just 0.3 of a Bitcoin now you’ll have more than what all the millionaires in the world will be able to afford if they all try to buy some in the future.
We’re still so early!
Source is recent Credit Suisse report - List of countries by the number of millionaires - Wikipedia