You'd be surprised by how many people would by the new Switch, even if they are owning one actually.
And there are 3 system sellers for the remaining of the year:
- Metroid Dread
- Pokémon remake
- Mario Party Superstars
Well, if you want to define "system-seller" as a game that moves any amount of extra hardware no matter how small, then I suppose nearly every game of note is a system-seller.
But if you're looking for games that will move significant amounts of hardware, those ain't it. Metroid is too niche to move a lot of hardware. Mario Party has never caused any appreciable sales growth. The Gen 1-3 Pokemon remakes (FR/LG, OR/AS, and HG/SS) did cause some hardware sales growth, but relative to other games of similar popularity, and especially compared to the earlier main series Pokemon games released on their respective system, they didn't move a lot of systems. In Japan, they caused bumps small enough to where if sales were tracked monthly instead of weekly there, you wouldn't notice their impact. They appeared to have had no effect at all in the U.S., almost certainly for the same reason as Japan: they likely caused small one-week bumps in HW sales, small enough to be unnoticeable when sales are tracked monthly.
Now, that does come with a caveat. The first three Pokemon remakes didn't get a special edition system, and we do know that limited edition systems do often cause bumps in sale. BD/SP is getting a limited edition Lite, and that could result in a bump. But the game itself? There's no reason to expect it to be a significant system-seller.