PS5 is about to take over PS4 launch aligned and Xbox hardware this year has been a disaster despite actually releasing some games this year unlike last year. The PS5 is looking to be more dominant than the PS4 was so I'm seeing it breaking the 120m mark. If this generation lasts a year longer than the previous one as has been suggested then the 130m mark shouldn't be a problem either.
2027 gen end = 120m-130m
2028 gen end = 130m-140m
They're my rough estimates currently.