It was written by the prophet jeremiah, before they were taken captive to Babylon as slaves.

Failed prophecy and the probability of it happening in the future is very nil to non-existent.

Jeremiah 31:33 - But this is the covenant that I will make with the house of Israel after those days, says the Lord: I will put My law in their minds, and write it on their hearts; and I will be their God, and they shall be My people. [NKJV]

Anathoth

Jeremiah (1:6) noted that he was young and not experienced in speaking. Isaiah said (6:5) that he was unfit for speaking and that his people were not worthy of prophecy.