pikmin, asuming they don't put everything on motion controls...
poke'mmo, have catching, gyms, contests, and photagraphy as main hooks. please no berry mixing, etc... have something like talents. a larger move list and or untieing increasingly restrictive Hms to total list. maybe add options for pokemon stances/strategies, say have one built for offense,defense, accuracy,and avoidance.passive ways to affect combat without items, which i rarely use. id say an OoC slow regen while still/logged out, but maybe thats too much.
starfox as long as its flight combat. don't run the story like the ds one, cuz honestly it made zero sense to me, who didnt see any version between that one and snes starfox.
all sound like good choices.
one i haven't seen mentioned: super robot wars/taisen. it hasn't gotten big in america, but i'd really like it and other games to cross the water more. the graphics of the ps2 version could probably work on the ds-3ds. i dont see any future for it on wii.
golden sun 4 seems likely because they left it wide open. again... T-T
the changes id like to see there are: stop repeating each quest objective at every dialogue stop, please please get matthew and group out of their parent's shadow, and please please PLEASE dont leave the next one even more open ended at the end than when it started, like this one did...