dose anyone know if there is a dreamcast emulator

or Xbox

no

Likely impossible for Wii, even on PC you need a fairly good PC to emulate Dreamcast, and the XBox is close in processing power to the Wii so it's pretty much impossible.

The PSP has a halfspeed dreamcast emulator. Having one on the Wii is more than a plausible concept.

Quote
Arikado
The PSP has a halfspeed dreamcast emulator. Having one on the Wii is more than a plausible concept.

well that's good news...

Do you think that the group will start some new emulators (SegaCD, Dreamcast, Virtual Boy ect) after they finish Wii64 and WiiSX?

I'm almost sure they will.