I agree with alcoatjez on most points here: Wii emulation will be possible once GameCube emulation improves. As for controllers: just hook up an original Wii-mote, as it's simply another Bluetooth device. Not using a Wii-mote will only work for those games that don't really rely on it (like Excite Truck in some extend I think).
Of course... don't hold your breath. It could be a while (if ever) before proper playable Wii emulation is made possible.