Dying young would have been a great career move for him.
Everyone who knows anything about him knows that he suffered a terrible auto accident in 1956, one that ruined his beauty and got him addicted to painkillers as well as alcohol, and which marked the beginning of the end of his career, his health, and his life.
If he'd died then, his reputation would be stellar - he'd be regarded as the male Marilyn Monroe, the matchless cult-figure talent whom the camera loved and whose infinite potential went tragically unfulfilled. James Dean would have been completely overshadowed! But no, poor Clift lived a decade afterwards, a decade of substance abuse, declining health, and little notable work.