Have the Merits of our Ancestors Been Depleted?

Why Yeshayahu describes the flood as מי נח - the waters of Noach. Was he at fault?

There are four opinions in the Gemara as to when Zechut Avot ran out, all of which transpired. The Chida finds an allusion to these four opinions in our Haftarah. What hasn't ended is ברית אבות - the treaty He made with them. What is the difference?

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