Without shortages I predict:
Switch: 110M
PS5: 25M
XSX: 15M
I don't think that Xbox would be much higher due to a boost in several countries due to a lack of PS5 units. PS5 was the most impacted by shortages, however I think Nintendo's Q3 of 2020 and Q1/2/3 combined of 2021 would have been higher as well.