I'm hearing smartphones cited a lot as reasons. The issue I have with this theory is that smartphones don't seem to have had a major impact on the 3DS.
Yes, the 3DS is selling less than its predecessor, but I think that's more to do with other reasons, such as confusing naming, lack of innovation, and being expensive (compared to the DS at launch).
"Never argue with stupid people. They will drag you down to their level and then beat you with experience."
-Samuel Clemens







