Somebody has - from another Forum:
"I can still use the Freeloader on the Wii to start up GameCube imports on the next-gen console"
He does offer a bit of caution though:
"I inserted the freeloader disk, and selected it from the disc channel, the system read it and restarted. Went back to the disc channel again, selected the freeloader and the system took me to the normal freeloader screen and asked me to swap the disk like normal. I am assuming that the freeloader disc needs to be in the system from the start, or it may restart after the first read"