Nintendo quarterly sales update (To March 31st 2023) Switch 125.62 million

[zorg1000]

Soundwave said:

Obviously reaching BOTW's 30 million is almost impossible given ToTK is likely not going to have 6 years to sell, but I suspect we will get Tears of the Kingdom 4K Edition with new DLC content on Switch 2.

It goes both ways, BotW had 6 years to accumulate those 30 million sales but was a launch title so it had to grow with the system. On the other hand, TotK will probably only have ~1.5 years to sell on Switch before the successor comes out but it has a massive install base to sell to right away.

Plus, like you mentioned, there will most likely be some sort of updated port released on Switch 2.