nah, mina will retire after twice to lead a quiet anonymous life in luxury or "a life of safety and comfort" as jihyo once said of mina mina will also look the same after 20 years
As popular as Sana is, being a foreigner will be a handicap for a solo career in Korea. Idk if any foreigner, esp a Japanese has built a super successful solo career in Korea. She could go back to Japan and really make bank but I'd miss her since Japanese stuff is so hard to access. I do hope she can get into acting and such in Korean shows/movies and become a big name tho.
You rarely see them doing things on their own so hard to judge. The timing also needs to be right for these things and I feel like it has already passed for some, with JYPE inevitably screwing it up for the rest at some point in the next few months.