4 more years are left until new successors start to surpasses them. Be patient until 2025
2011 SNSD
2012 Big Bang
2013 2NE1
2018 Twice
2019 BTS
2020 BPink
Why 7 years?
Year 1:
Old gen fans are leaving high school and use their college tuition money to help their faves achieve record breaking sales
New gen fans are entering high school and starting to learn how kpop stanning works
Year 4:
Old gen fans are entering the real world and kpop is slowly becoming less of a priority
New gen fans have more money to buy more albums and contents of their faves
Year 7:
Old gen fans failed at life and have to cut off kpop completely to make up for the lost time
New gen fans become old fans and their new generation take over the top until 7 more years
Then the cycle repeats again