Its isn't that there's not enough "original" titles. Its kinda that there aren't other popular [and extremely hyped] franchise on the 3DS... yet. Look at all the "Top Game" lists around GameFAQS (not the best piece of evidence, I know...) and see how many "Original"/New IP/Non-franchised games are on the list atm.
Vita - Only 2 PS3 - Only 2. And that's assuming the Tales Of game is "original" on its own merit. DS - Only 1 PSP - Only 2 360 - Only 2
There's always original games. People always buy original games. Sometimes original games make more money. But the 3DS isn't doing bad (the way you put it) because there aren't enough "original" games. Its the lack of big name familiar franchises that aren't Nintendo's.
tl;dr - Needs moar Final Fantasy, CoD, Assassin's Creed, and cow bells.
Currently Let's Playing: Super Mario Galaxy 2 http://www.youtube.com/user/DTFaux
Not ENOUGH Original Titles....... Super Mario 3D Land Mario Kart 7 Kid Icarus Uprising Luigi's Mansion 2 Resident Evil Revelation Paper Mario Super Smash Bros Dead or Alive Dimension Pilot Wing Resort Steel Diver I can keep going but no point since.