The 3DS couldn't handle most Vita games.
Heck, New Little Kings Story's frame rate is ropey enough as it is on Vita.
Also generally Vita games seem to sell better than 3DS games that don't have a Nintendo logo so I don't think many would actually thrive on 3DS. Besides, I thought Vita had no games worth playing anyway? :p
*edit*
Actually, Invizimals would have a lot of potential to do well on the 3DS once the Pokemon buzz dies down.








