PS3 + 360 = ~35m
PS4 + XBO + PC = ~100m
Considering the game continues to be in the top sellers each week despite being 6 years old on PS4/XBO.... I can see the PS5/XSX versions selling many copies also.
25m should be the minimum expected for the next-gen release. TBH it wouldn't surprise me if it sells over 40m maybe even 50m on next-gen systems.