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When God wished to give the Torah to Israel He said to them ‘Will you accept my Torah?’ They responded ‘Yes.’ He said, ‘then provide a guarantor that you will keep (the Torah).’”
Let’s face it, God is beyond time so He knows full well whether we were destined to keep the Torah or not. Therefore the question can’t literally be “who will be the guarantor,” but rather, what will motivate the Jewish People to keep the Torah. In fact, from our perspective of living 3,000 years since the Torah was given, we can further define the question of the Midrash. After all, for much of Jewish history the majority of Jews were not observant.