Morrie is candid about his biggest dread about the disease, what is it?

From the text:

The two men spoke about the afterlife. They spoke about Morrie’s increasing dependency on other people. He already needed help eating and sitting and moving from place to place. What, Koppel asked, did Morrie dread the most about his slow, insidious decay?

Morrie paused. He asked if he could say this certain thing on television.

Koppel said go ahead.

Morrie looked straight into the eyes of the most famous interviewer in America. “Well, Ted, one day soon, someone’s gonna have to wipe my ass.”