Currently Online 
I'm expecting a similar or just slightly lower attach rate than MK8 and a somewhat lower sales of the Switch 2 compared to Switch, so my guess is in the 40-50M range.
Meanwhile, if Nintendo continues to produce the cartridges for the OG Switch, I expect MK8DX to sell another 10M, mostly to Switch 2 owners, bringing it close to the Wii Sports total
The Nintendo eShop rating Thread: http://gamrconnect.vgchartz.com/thread.php?id=237454 List as Google Doc: https://docs.google.com/spreadsheets/d/1aW2hXQT1TheElVS7z-F3pP-7nbqdrDqWNTxl6JoJWBY/edit?usp=sharing
The Steam/GOG key gifting thread: https://gamrconnect.vgchartz.com/thread/242024/the-steamgog-key-gifting-thread/1/
Free Pc Games thread: https://gamrconnect.vgchartz.com/thread/248138/free-pc-games/1/
