Divine judgment is absolute and unavoidable, even when its full meaning and actual fulfillment take a long time to unfold. God's anger will not calm down or fade away until He completely executes His intentions. He will not rest until He carries out the thoughts of His heart, bringing punishment upon those who have rebelled against Him [מצודת דוד, מלבי״ם].
The full realization of these events will only occur at the end of the process, after much time has passed. At that point, people will gain a complete understanding of the prophetic warnings. Even though the punishment may seem delayed, it will eventually become clear to everyone that God never retracted His anger despite the passage of time. They will recognize that the consequences they face are a direct result of their past rebellion [מצודת דוד, מלבי״ם, ביאור שטיינזלץ].
A broader approach views this future period specifically as the Messianic era. Until that time, people struggle to grasp the truth of the prophecy because they do not witness the immediate downfall of the wicked. However, in the distant future, everything will become completely clear, accompanied by an overwhelming and intense level of understanding. Furthermore, the promise that the current audience themselves will be the ones to understand this in the future, rather than an unnamed later generation, serves as a hint to the resurrection of the dead during the Messianic era. The very people hearing the warning will stand in the future to witness and comprehend its ultimate truth [רד״ק].