Do you mean everyone in the world? I don't think that everyone in the world will have BTC or buy it. Although the market supply of BTC is limited, it doesn't mean that everyone holds it one by one. You can check that someone may have more BTC.
In this case, the BTC also doesn't depend on how many people have BTC but from its market circulating supply, trading volume, and also its market chart. If the chart of BTC can have always positive, trends, I believe to reach around its ATH this year or next year. However, to reach about $100,000, or $500,000 in some years later? Well, probably but it is very difficult.