He's said before he expected sales this year to be around 27m and sales in 2021 to be around 22m. Unrealistic expectations. 2021 being higher than 2019 sounds like a pipe dream.
If the Switch would somehow pull that off, then PS2 and DS would get some serious competition on the top, that's for sure!
But I agree, 27M is just too high. I could see 2021 being around 2019 numbers, maybe beating them by a couple 100k, but not by several millions or anything like that.
For the record, I expect 22-23M this year, so a 10-15% drop the year after could still mean 2021 wins over 2019, if just by a hair. But I'm expecting more like 18-19M for 2021 - which would still add up to over 40M over the course of those 2 years.
The Nintendo eShop rating Thread: http://gamrconnect.vgchartz.com/thread.php?id=237454