Cary Grant had a marvelous analogy to explain the mechanism of fame in Hollywood.

He likened the whole film industry to a tramway car with only so many seats and standing space.

The tramway car is always full. Some people try to step on board from the front door but that can happen only if some people leave the car from the back door.

The prime locations are the seats in the middle. Then come the standing slots in the middle.

Some actors in Cary Grant