Two more years and Twice will have 11.5M album sales probably. Then, if they sign an extension, they will surge past EXO and TVXQ by the end of 2023, which will put them second all time in album sales by a Korean artist.
This ignores things like BBJP, RIAJ, etc and only counts sales from Oricon pos and Gaon shipments...so it's not fully accurate.
Twice will hold the 4th spot for now until Seventeen surpasses them maybe in a couple of years. EXO might add to their total when all members are discharged from the military. Anyway as longas TWICE is the BEST_SELLING Female Artist, its fine with me.