Why people have lost interest in BTS:
1) They have treated their fans as purely consumers, now more than ever. Overpriced albums, recycling songs for compilations, regular McDonald's meals with a Chinese sauce and passing them of as their own, etc etc.
2) The music they release now has lost their personal touch. The title songs have been uninteresting or just outright bland. Even middling songs, like "Black Swan" and "Life Goes On," are extremely disposable because you can sense it was written with a Western outsider's point of view and BTS played little-to-no-role in their conception. Their English songs have been an outright embarrassment. There's not one iota of originality in them anymore. Lyrics have no substance, nor any emotional resonance. Even a song like "Permission to Dance" should have been a joyous affair, it just sound downright dour. "Butter" was the last straw. They have sanitized themselves for the West, and in so doing, they did it to their music as well. Their music don't come from the heart anymore.
3) There is too much corporate-speak coming from RM nowadays. They're too busy playing banal politicians to know what is going on with people today. Try as they might, they will always protect their image and play the corporate political game just to stay up on the zeitgeist. I blame this on the leader (who should know better) and their company (who are beholden to their shareholders).