Well, if there are people thinking about developing a Dreamcast emulator for the PSVita and the New 3DS, it would possibly be possible for the Wii U too since it is superior to these consoles.
At least for now you can play some Dreamcast games that came out for Game Cube / Wii by Nintendont as Sonic Adventure 1/2, Phantasy Star Online, Crazy Taxi, RE:Code Veronica, MDK2, Skies of Acardia etc...