When "Older Brother" idol groups become "Uncles", there is a cycling of generations in the idol world. It might be a harsh truth, but fans constantly demand a newer, younger group to turn their interest towards. Cycling of the new guard and the old guard has become something of a normal process for idol groups. We are now in the 3rd generations of idol groups, and there is a war brewing here like the old times.
When Korean music became K-Pop and Hallyu, idol groups began to spring out left and right. There is a deluge of idol groups in Korea right now, with many groups falling off the way side while a select few gain enough attention and popularity to be noticed by the fans. When they do, and they have the talent to grow, they have the chance to be superstars.
Right now, there are three major entertainment companies churning out mega-star idol groups every time they release a new artist