Rabbosai, there is a lesson in Medrash Rabba (early in sedra shmos) about legacy in ruchnyus. It says, if a person is moser nefesh for a mitzva, that mitzva will never be absent inn his progeny. The medrash gives an amazing example: Yisro, and Yael eshes chever Hakeini. So the guarantee does not mean that extraordinary middos/accomplishments occur in every generation, and in the case given, perhaps not even a blood relative. So yichus is nice, because it is a chain in which every so often, a link shines brilliantly. It also indicates that is also nice to start a new chain.
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