Prophetic warnings sometimes end not with destruction, but with a deep spiritual shift born from an unexpected source: Divine forgiveness. When future redemption and grace are finally given to the people, these gifts will not cause pride. Instead, they will create a deep sense of humility and shame over past actions.
As God renews the covenant and gives the people good things, they will remember their bad ways and feel ashamed [ביאור שטיינזלץ]. This reaction comes from realizing that God is keeping His covenant even though the people had completely broken it [מצודת דוד, רד״ק]. Receiving such free kindness will make them ashamed to even look up to God, knowing full well that this grace is not a reward for their own good deeds [רש״י].
This shame is also connected to the atonement process itself. The people will realize that other sinful nations were forgiven before them simply because the sins of those nations were less severe. Recognizing the true heaviness of their own actions will cause a deep shame that prevents them from sinning in the future [מלבי״ם].
Overwhelmed by this feeling, the people will lose the courage to speak up [ביאור שטיינזלץ]. During the long and hard years of exile, they felt they had a valid complaint against God, believing their punishment was too heavy to bear and left them without hope. However, once complete atonement arrives, any right to complain about past troubles will disappear. They will no longer be able to speak with pride or arrogance [רד״ק, מצודת דוד].
The peak of this process happens when God totally forgives them for all the wrongs they committed. This absolute forgiveness is the greatest act of all. It exposes the huge gap between the people's betrayal and God's loyalty, finalizing their feeling of shame and submission [רש״י, מצודת דוד, ביאור שטיינזלץ].