There are some that remained in print, however, and so I held off on taking the plunge because I didn't feel like dropping $40 for Fire Emblem Echoes (for example), knowing it would probably be a year before I played it.
But knowing that the console and likely all first-party games will soon be OOP certainly lights a fire under me, as I'd much rather pay $40 for a new, sealed copy of the game than $70 for a cart-only copy of the game off eBay in a year's time.
Radiant Historia: Perfect Chronology evidently went OOP while I wasn't looking, and the Ebay price has already skyrocketed. Argh!
EDIT: And yes, I've got a couple from the eShop (Devil Survivor's 1 & 2 and Soul Hackers), but I prefer carts since they're not locked to my system/account. And who knows when Nintendo will decide to shut down the eShop, just like they did for the Wii shop?