I remember back when Wii was still called "Revolution" that people were desiring any news of a MMO made on Wii. Though the months and years past and no developer seemed to touch what might of been an MMO giant. Sure Wii doesn't compare performance-wise to something like a PS3 or Xbox 360, but who said the problem affecting the MMO genre was graphical power?
What MMOs might need is what Wii CAN EXCEL AT....innovative gameplay mechanics!
Picture a vibrant world where your characters' weapons can come to live with the swinging of a Wii wand. Firing arrows more realistic or accurate using your wii wand and nunchuck like a bow and arrow. Waving the Wii wand to cast spells or charms to heal party members or harm enemies. A dedicated Wii channel that can update you on the latest events and info without checking the official or third-party website(s).
The possibility is there, but the issue is...why hasn't a developer attempted such an inspired project?
That and many other Wii MMO idealists wonder the same thing.