Think about the period of time it was released in. While certainly the promo around the song being Diana's last with the Supremes didn't hurt, this was also at the height of the Vietnam War. I can imagine that this song's lyrics were very real for those with loved ones serving overseas or even with some who had perished. I think it was destined to hit #1 as Diana Ross and the Supremes or simply as Diana Ross. Even without the war element, "Someday" as the debut single would've probably been viewed by the public as Diana's goodbye to the Supremes anyway.
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