at least you used the politically correct word disband instead of disappear. A little less ominous but still as creepy.
And yeah ur faves won't get the boost you think they will .
Armys mostly stan one group that we consider superior . We'll stan solo projects by the members that will still exist since they didn't disappear thankfully in your hypothetical scenario .
So yeah another group could get that sweet number 1 ur salivating over (also the daesangs you dream of ) . But their metrics won't get anyway near BTS's level and the interest in kpop will go down.