One day, someone will create a fictional story where Nakiri and Soma are married, have a kid etc., and in that story, Nakiri will be cheating on Soma with his dad. Feels like this is possible since Nakiri admires Saiba, wouldn't be surprised if someone made a story where they are together behind Soma's back
i.redditmedia.com/fnIJ3o4gXK2ICfkmUTU9ZQ1gm39BOk9JN3bbUyZ6lEE.jpg?w=320&s=ea8892f60dec6b3a81d1ebf13b20ff85 Creator of Shokugeki no Soma, Shun Saeki, did a Q&A on social media a while back (particularly Twitter), and suggested she "could be deceased", but never mentioned other possibilities on her whereabouts -- so I'd assume she's indeed deceased. I would also think Soma's father, Jouichiro, would have negative outlooks when it comes to his cooking if they had divorced, but not so much if she had passed away. Jouichiro himself made a comment to Soma about finding someone special to share his cooking with. Those are just my thoughts :) Hope I helped!
I hope I am not the only one who is thinking about Suzuki-sensei getting married to Erina and beating Soma in the cook-off that they will have... I hope that doesn't happen... (in Shokugeki No Souma: Gou No Sara/ Food wars: The Fifth Plate)