I've just checked Circle mid year chart and we have now 24 GG songs in the top 100, with more to come to the year end. Last year the number was 25 and the trend will continue next year
To put things in perspective, the peak of 3rd Gen was 2018 with 19 songs, 2015, 2016 and 2017 all had less songs than 2018
4th gen top girlgroups are on 2nd gen level. They can chart their whole albums and have several hits charting high at the same time
2nd gen of course still bigger, because they have not only top GGs but several mid tier GGs releasing hits occasionally, much more than 4th gen
But overall 4th gen seems the second biggest generation in Korea and I believe they will keep dominating the next 2-3 years
What do you think?