Remember just a couple years ago Knetz would say "You can trust JYP girl group"? That really went down the drain didn't it?
Same with YG, Big Bang's reputation was so good that at the times when no boy group was charting Ikon and Winner were competing for SOTY.
It is really important to maintain the consistency. So never say never, Hybe can go down as easily as they rose.
SM on the other hand has been the most consistent company for decades now. Their highs were high but lows weren't that low either. When you think of SM, worst you think is NCT and RV, still one of the top groups of their generation.