3DS games will likely be able to link to DS games (Pokémon 6th generation would suck otherwise, though the GBA break sets kind of a precedent), so they should be able to access the same local wireless connectivity as DS games, which would not rule out Wii link. Ultimately however, it depends on whether the developers of 3DS/Wii software decide to implement it, and if they do so before a successor to Wii has been released.