That's the reason why not everyone can be rich.
If you can buy bitcoin, get bitcoin, and can hold it, you can be rich.
Only people who have money can buy Bitcoin, while most of people are struggling to meets end their needs.
It is like if we want to have money, we must get it from our parents, family or from working and salary. The same with Bitcoin, if we want to get bitcoin, we can use our money, sell our house, land, any asset and convert it to bitcoin by buying bitcoin, or we can work for salary that can be received directly in bitcoin or in fiat that will be used to purchase bitcoin.
Receiving bitcoin as salary is a way to get bitcoin, without buying it. Many companies with Bitcoin acceptance, don't purchase bitcoin, but they sell their products to customers, and receive payments directly in bitcoin.
However, are we still survive in 2140? I really doubt it.
I don't care about it because I won't live long till 2140.