For 2 reasons.
1. He's the most popular and known idol. I don't think people know how the WC has forever changed the trajectory of his popularity but it has and I'm hearing some of my friends (men) who know of him because of the WC. And also the fact that BTS gets covered by world news, expect major news outlets reporting on it.
2. He's also the most overprotected and overshipped idol. ARMY still treat him as a baby or that he's afraid of girls because he's the youngest. But also so many will turn on him whichever way you look at it.. Many delusions and y/n would be shattered. Just from this point alone his dating will be the most viewed/talked about/mentioned in kpop history.
Bonus 3rd reason. If he dates a female idol that has more lesbian energy like Sana or Irene, that would be the most talked it couple ever. But if he dates someone normal, it still won't matter because he has the power to have army implode on themselves, the female idol"s fandom he's dating implode on themselves and the media and non fans loving every minute of it and fanning the flames.
So if this forum wants to revive from the ashes, Jungkook needs to be revealed to be dating.