2DSi/3DSi replace Wii U Gamepad?

[OdinHades]

The 3DS lacks the integrated parts for Nintendos streaming technology. With the 3DS the lag would become noticeably higher, at least as high as remote play with Vita and PS4 (about 100 ms). As the 3DS doesn't support WLAN n but only g, I think it would be even higher, something like 200 ms or even 300 ms. And that's dangerously close a level most people would call unplayable. PSP/PS3 remote play operated on that level of lag and I think that setup is quite comparable to Wii U + 3DS.

So no, it won't happen. Not in this gen.