before that will happen dolphin needs to run at 100% accuracy and 100% speed!
And you will need to make a 100% backup of the NAND of your Wii to dump your own wii-signature - with this a wii authenticates with the nintendo servers.
1 little slowdown in emulation and nintendo would know that it's not a real wii that is playing there online...
-if i were nintendo i would ban that device/signature! (yes... so your real wii is banned too!)
And you will need to make a 100% backup of the NAND of your Wii to dump your own wii-signature - with this a wii authenticates with the nintendo servers.
1 little slowdown in emulation and nintendo would know that it's not a real wii that is playing there online...
-if i were nintendo i would ban that device/signature! (yes... so your real wii is banned too!)

for Dolphin