Aside from Xenoblade Chronicles 3D, New 3DS owners haven't had too many games to justify their purchases. Sure, the super-stable 3D, improved processing power, and C-Stick are useful in a bunch of games, but they're not essential. Now that the Unity Engine is coming to New 3DS and New 3DS XL, there could soon be dozens more reasons to buy an updated handheld.
Unity plans to make its engine available for "Nintendo, Nintendo's 3rd party developers and over 4 million registered Unity developers." If you don't pay much attention to all those pre-title splash screens, know that Unity runs everything from Crossy Road to Ori and the Blind Forest to Oddworld: New 'n' Tasty, and it already supported Wii U.
All those developers will soon have an easy way to create new games or convert their old ones for New 3DS. That's a welcome change for everybody who rushed out to buy a New 3DS in February only to wait months for its second exclusive game to be announced - and that's using the term "exclusive" very liberally, since The Binding of Isaac: Rebirth will soon be out on just about every console except old 3DS.
Either way, it looks like indie developers may be the ones to make this new-ish handheld system worth owning (sounds a bit familiar), at least until Nintendo builds its release calendar back up from "crickets chirping and tumbleweed".