Iz*One still manages to chart, despite being disbanded for a few years now. And the members are frequently high on brand reputation lists
From a sales comparison,
Blackpink-
Korean sales: 6,551,696 copies sold
Japanese sales: 223,739 copies sold
2017: 58,332 copies sold
2018: 301,181 copies sold
2019: 419,563 copies sold
2020: 1,735,433 copies sold
2021: 469,992 copies sold
2022: 2,847,139 copies sold
2023: 729,440 copies sold
2024: 214,429 copies sold
I think for iz*one as a group to be popular it shd be comparable sales/merch/lightstick but I don't think new printings/merch/lightstick/tix r available so I could only say post izone members r doing well!
I hereby retract SNSD, KARA as disbanded/grps tat r still popular as per replies from ahsoka n cherish(by the argument of sales/merch/lightstick or SNSD/KARA not being disbanded/selling albums/other stuff due to unavailability rn.)