I won't comment about NJ's ultimate fate in this piece.
However, it is true that NJ got the best trainees, which skewed the whole girl group plans of Hybe.
Because the best trainees were gone, LeSserafim had to do with two people from IZOne, who are now showing their age, and what was remaining and their best member was lost because of the bullying accusation.
Illit is even worse - again the only member who could speak English was lost because of an unknown cause, which has made Yunah completely superfluous. If Hybe had flexibility it would have cut Yunah, made Minju the leader, and would have added one of the people from R U Next to fill the gap. Why BeliefLab did not cut Yunah after Youngseo's departure is only known to its head, but that left Illit with only 2 members who are worth anything, Minju (YG Trainee) and Iroha (JYP trainee).
Yunah does not belong there, Moka can't sing to save her life, and Wonhee simply can do nothing. It doesn't help that the latter two are injury prone as well.
NJ has all of its members getting fame. Hyein was less known but the Senior Singer had given Hyein a chance to collaborate in a song of the former owner of Edam Entertainment so Hyein was recognized too.
Illit has no members who can speak English, one member who is completely incompatible with the group's concept and two members who subtract more from the group than add to it.
Although its second album is being delayed because of the MHJ circus and the injuries of the members, its execs will be thinking hard about what to do with it, since if its 2nd album does not do as well as Magnetic, it will probably see a future not too different from MissA, with only Minju surviving, and Iroha probably returning to Japan where because of her young age she will get one more shot.
The Hybe plan was probably like this - NJ conquers world, LeSserafim mostly concentrating in Japan and USA to some degree as it became popular in there, and after LsSserafim moves to USA, like Twice did, Illit takes over in Japan.
But because of MHJ NJ is now useless to Hybe, so Illit , who was never intended to advance outside of Japan, now has to fulfill the role intended fro NJ, which I do not think it is capable of.
It would have been cruel to Yunah, but I think she should have been replaced by an English speaking member if BeliefLab had plans to promote Illit beyond Japan. Business is business.
Not replacing Yunah will probably result Illit reaching a lower height than NJ did.