Will Switch outsell DS? PS2? Or neither?

[Manlytears]

Wman1996 said:

If we have a Game Boy/Game Boy Color situation again, I say Switch will surpass DS and PS2. The Game Boy/Game Boy Color divide is still one hotly debated. Game Boy Color had hundreds of games that wouldn't play on the Game Boy, but some games did. An Iwata Asks interview called the Game Boy Color a successor to the Game Boy, but Nintendo lumps their sales together.
So what I'm saying is that if we get a Switch Pro with hundreds of games or more that don't work on the Switch (especially some new first-party games), but it is very similar to Switch in a lot of ways we could see Nintendo combining sales again. The Pro momentum could be enough to last Switch until 2025 or beyond, and reach over 157 million units.
But if Switch Pro is like DSi or New 3DS, I don't think it will be enough. It's certainly possible for Switch to still beat PS2, but I think it will still be behind DS and PS2.

This! It's all about how Nintendo will treat the "new switch", it's all about Nintendo official word. If Nintendo wants to make a new system with several exclusive games and say "this is still a switch" then it will be like that, as it was with GB / GBcolor! If it is in their interest, they can launch numerous "switch updates" for 15 years and count everything as "switch sale".
There is no objective criterion here, it is all a discretionary act! If Nintendo says "it is", then "it will be".