What does Deuteronomy 31:20 mean?

I'll bring them into the land I promised their ancestors—a land full of good things to eat. But when they've eaten their fill and gotten comfortable, they'll turn to other gods and worship them, rejecting me and breaking my agreement. Deuteronomy 31:20 - Modern Text Bible

(God predicts that prosperity will make the people forget him and chase after other things, breaking their relationship with him.)