Dragon Quest Monsters: Terry's Wonderland, Dragon Quest VII, Fantasy Life, Culdcept 3DS (never happening), Bravely Default, Rune Factory 4, and EX Troopers
The easiest answer is just looking at the current state of third party software sales (in the States, at least) on 3DS, plus the strong (though declining) yen. I think it's too much of a gamble to bring most of these titles over, and probably will be until post-Pokemon X/Y, and may still be even then. eShop-only releases I can get behind, but who knows if even that's worth the time and effort.
That Soul Hackers is happening is really enough for me at the moment, but I'd really like to see Fantasy Life, in particular, brought over.