Not all markets will jump immediately to the newest consoles. Brazil for example is lagging behind greatly when it comes to video game console due to high taxes and poor wages. PS2 and PS3 are still popular there. Even Sega Genesis was sold in Brazil up until recently (yes, newly manufactured Genesis).

Ig it depends on how close Switch 2 is to the original switch and if Nintendo decides to group them together in their reporting numbers like they do for the DS all the way up until the 3DS.

I think if there are no "Switch 2 cartridges" and it's all just Switch Cartridges, with just Cartridges that need a Switch 2 to "unlock full performance" it'll probably be grouped the same. That's how it was with the DS, all DSs could play all DS cartridges with just limited performance or missing features (e.g. a DSi "enhanced" game would work for the most part on a DS Lite). Up until the 3DS, at that point the cartridge format changed and only the 3DS could play 3DS carts and thus Nintendo breaks it away into its own sales numbers

I hope they don't because I refuse to acknowledge anything dethroning the PS2 for global sales.