That's kinda counterproductive though, as the Wii doesn't use emulation at all for Gamecube games, it uses a compatibility layer, which is why the CPU uses the IBM PPC architecture in the Wii. To emulate the Gamecube you would have to more than just inserting the emulator. The amount of work needed to emulate a Gamecube (as opposed to simply running it via virtualization) would require tremendous optimizations, coding, and a beefy CPU.
Why would you want to make the Wii do something it can already do? I'm lost.
at the time it was simply because I lost my Wind Waker disc but had the ISO file available, that was really all, which is understandable why nobody worked on it until the Wii U decided to take away GC compatibility.