I'd say most people hope it makes them rich, not necessarily expect it. More likely, aiming for a high return they can't get anywhere else.
It's a distribution like anything else. A handful of billionaires, a larger group of millionaires, and then comes the sweetspot.
The sweetspot for crypto is middle class (from lower middle class to higher middle class) doing a 5-10x from whatever they put in. Not enough to retire, but meaningful wealth. This return is within reach for almost anybody with some study, patience, and proper risk management.