It's hard to say. Travelling Merchant would be a massive addition when one considers the exclusive items attached to him. I spoke with Deanzor about this a while back (asking about beetle armor and Travelling Merchant, specifically), and he responded by essentially saying it is much more likely for a small addition like Beetle Armor to end up on this port than something similar in magnitude to the Travelling Merchant.
So to answer your question, I personally believe there is a possibility of its arrival on N3DS, but I would not count on its addition.