I don't think we'll see that this generation, as in that interview, you can't just port games easily, and I guess an emulator is far-off. GB, GBC and GBA had simple architectures to emulate, at least when compared to 3DS titles. What to do about the home menu, Friend list integration, Streetpass etc?

There's just so many features on the 3DS, and if they were going to make current, new games playable on the Wii U, they would make sure that all marketed features would be included, just my guess. It will take more time than the GB emulators. At least you had all features available on the Super GB and GB Player, except maybe infrared communications. Oh and of course multiplayer if I remember right.

im still waiting for cybernator / assault suits valken for snes..

There already are. Resident Evil: Revelations, Batman: Arkham Origins Blackgate, etc. But, as for Nintendo directly porting it's own 3DS games to Wii U, lets not jump the gun. Virtual Console is currently up to Gameboy Advance as far as handheld games are concerned. Let them do Nintendo DS games like Advance Wars: Dual Strike and Days of Ruin, Fire Emblem: Dragon Song, etc. first.

I won't repeat what others have already mentioned, so I'll just add that it will cause you to lose 3D capability; unless you have a 3D TV, and I'm still not even sure if that would work.

Ehm...Nintendo 2DS?

Anyway, I really hope they will. There are a couple of 3DS games I would like to play, but I'm not going to buy a 3DS since I hardly play with handhelds.

Don't see it happening for a long time. The GB Player and Super Gameboy/2 were done yes. But No DS equalant was made for Wii. And no to a 3DS. VC is porting it. VS the Super and Player had the hardware (Super Gameboy 2 added the link cable port) built into them. Same goes for the N64 Transfer Pak. Here are my cleaning photos. Full GB/GBA hardware inside.

The 2DS sold a pittence compared to the other models.

I'm guessing 2016. I'll buy FE Awakening. Althought, I have a 3DS so hummmm.

We need to have GC games on the WiiU's VC before we start dreaming about 3DS games!

Yeah... probably next gen. And I would prefer on next gen.
Putting 3DS games on the Wii U VC would hurt 3DS sales, BUT making an adapter to read and play 3DS THROUGH the Wii U wont hurt as much.