Eli's sons probably thought they wouldn't be held accountable for their actions, that they could continue to sin against God and smear His name as they refused to repent even though they were supposed to be in positions of spiritual leadership.
God may have delayed their punishment, giving them a chance to repent, but the punishment was inevitable and eventually God's patience ran out.
The same is true today. He is patiently waiting for as many to be saved as possible, but eventually the time will come when His patience will end.
Tomorrow's Bible In a Year Passage: 1 Samuel 5:1-7:17, John 6:1-21, Psalm 106:13-31, Proverbs 14:32-33