I don't know if that's even possible. The 3DS has pretty good third party developer support and a huge back library.
The true worth of any system is how many high quality games are on the system and whether they're the games you want play.
Outside of the obvious "must have" first party titles, I can't see a whole lot of system-selling "must have" third party titles. If you're not into Nintendo's own games, you pretty much have no compelling reason to get a Switch. And if Switch hardware sales aren't strong enough, third party developers will stay away.
It also doesn't help (especially for parents on a budget) that Switch games are around $20 more than 3DS games.