Well spoken. I completely agree with you. I actually fell for kpop through BTS around 2016. Really loved them at the time. But I stopped caring around 2019 or something. As I discovered many other groups and music that I fell in love with. I found out that kpop had so much more to offer than just BTS and BP. They haven't been really active that much lately. I saw that they would come back with an album, idk if that's already happened but I'm not interesting in checking it out tbh. They've definitely had their peak already and I don't think they will survive military enlistment either. Maybe after that, they will still remain popular in the western industry. But I think not in kpop. I don't think that kpop fans, or like you said fans for 5+ years, will care for them anymore. Also I feel like that most armies are just armies and nothing else.
That definitely doesn't mean that they suck or their music suck, but I just don't care for them anymore.