Dulfite said:

We know Switches head (2017) was big, and it's belly and thigh's are or will be massive (2018-2021), but what I want to know is how big are it's legs (2022-2023). That will be the deciding factor if it can get over 100 million or beat the PS4. 2022 and 2023 are critical to that.

I assume there will be some sort of hardware update announced or launched in 21-22. The Switch has done an excellent job of porting last gen games with improvements and current gen games with some cutbacks...but once the PS5 and Series X are out, it will get interesting for 3rd party devs as they will attempt ports (how can they not by then the Switch might have a 65-70 mill installed base) on the system.