No doubt they are no.1 group atm. If this continues, I can see them selling well over 300k for their next album and it may keep increasing. But usually most groups peak by their 5th year after which they start declining. So how long do you think Twice is gonna last? I think it depends on how long and how well JYP manages them. Looking at their success now- it can either go up or remain stable till another group comes along. Statistically speaking they won't be declining any time soon if they really have a loyal fanbase that will stick with them and they aren't just a trend or a 'bubble'. But then again, I have my doubts because not every group survives for long after their popularity escalates this quickly except a rare few. Please share your thoughts and don't be rude.