In my opinion, I don’t think there will be a “nation’s girl group” for 4th gen. I honestly think Twice is gonna keep that title for a long time.
The trend for 4th gen ggs is usually girl crush or teen crush or anything that isn’t “cute”. And most 4th gen ggs don’t chart as well with these concepts.
So that’s why I think the next nation’s gg will come from 5th gen. Or maybe at the end of 4th gen.