Ever since the DSi jumped onto the scene for it's very brief life it caused Nintendo to pull a 180 and be complete tools about locking down games to systems all in the name of security due to the now online capabilities on the hardware with an attached storage medium (SD card.)
I used to import stuff now and again with the DS, GBA, GBC and earlier because it was an open book and we did get hosed out of some real gems and I still have some of them with the GBA. I then look at the 3DS and I see some fine games I'd love to take a crack at but we just get cut off from the stuff. There has been some RPGs like the Tales of...series, Dragon Quest, and more we didn't get I'd have bought. Back on the DS there was Soma Bringer which looked cool too.