Bitcoin transactions are no faster than fiat digital transactions that you often do via ATM or mobile banking so not everyone will do it with bitcoin.
They are, though. When you transfer fiat electronically, the vast majority of the time all that changes immediately are the numbers you see on the screen, as your entry in the central database is updated, and no money actually moves hands for several business days. And even once the money has moved hands, it can be reversed or clawed back for months after. Bitcoin transaction can be completely finalized in 10 minutes.
For example, early adopters profiting huge as BTC goes mainstream, etc.
Which is the case for almost any asset. If you happened to mine a ton of gold before it became popular, you make a huge profit. If you buy a bunch of land or property in a neighborhood that later becomes the next big development, you make a huge profit. If you bought Amazon or Google shares when they were still operating out of a garage, you make a huge profit. Almost any well performing asset shares this characteristic.