They're not flopping in Korea but definitely underperforming. They're third in peak ULs behind Aespa and Jennie. In fact, their ULs are similar to Bibi/Idle/IIIIT levels. Sweet and Bubblegum will be their first comeback without a #1 and their ULs have fallen way behind last year's.
I think 4th gen's peak is over. If Youngji continues to shoot up and ends both Supernova and Supernatural, i think you can call it for sure. I think the Hybe/MHJ scandal ended everyone in 4th gen tbh, when historians look back on this era, they will point to the scandal as the straw that broke the camel's back.
What a waste. Everyone got hurt. NJ, LSRFM, IIIIIT, Idle, Ive, even Aespa (even though their fans are probably dreaming of a glorious future charting run that will never happen), the long term damage has been done and 4th gen will never reclaim its peak glory years of June 2021 - June 2024.