Yes, Jerusalem is doomed! Judah is collapsing! Everything they say and do is against the LORD; they openly insult God himself. Their prejudices will be held against them. They sin as openly as the people of Sodom did. They are doomed, and they have brought it on themselves. (Isaiah 3:8-9)
Then I heard the Lord say, "Whom shall I send? Who will be our messenger?" I answered, "I will go! Send me!" So he told me to go and give the people this message: "No matter how much you listen, you will not understand. No matter how much you look, you will not know what is happening." Then he said to me, "Make the minds of these people dull, their ears deaf, and their eyes blind, so that they cannot see or hear or understand. If they did, they might turn to me and be healed." I asked, "How long will it be like this, Lord?" He answered, "Until the cities are ruined and empty---until the houses are uninhabited---until the land itself is a desolate wasteland. I will send the people far away and make the whole land desolate. Even if one person out of ten remains in the land, he too will be destroyed; he will be like the stump of an oak tree that has been cut down." (The stump represents a new beginning for God's people.) (Isaiah 6:8-13)
The expressions which follow are those which denote hardness of heart and blindness of mind. They would hear the words of the prophet, but they would not understand him. They were so obstinately bent on iniquity that they would neither believe nor regard him. This shows the spirit with which ministers must deliver the message of God. It is their business to deliver the message, though they should know that it will neither be understood nor believed. (Albert Barnes Notes on the Bible, on Isaiah 6:9, "No matter how much you listen, you will not understand...")
A time is coming when the people of Israel who have survived will not rely any more on the nation that almost destroyed them. They will truly put their trust in the LORD, Israel's holy God. A few of the people of Israel will come back to their mighty God. (Isaiah 10:20-21)
God has decided to wipe these people out, but He will still leave a remnant, a select few who will survive and return to Him.