The problem is that we have NAND backup methods such as BootMii. You could take a Wii with a full set of tickets, use this fabled official method to transfer its account to a new Wii, then restore the NAND of the old Wii and you'd be able to use every game on both systems. Sure, you wouldn't be able to buy new games on the old Wii, but the new Wii is ripe to clone to another Wii and so on.
Note that I do not condone any of these actions. It would be disgusting to do such a thing. But there is no way I can see that Nintendo could block this functionality without first properly blocking BootMii.
Note that I do not condone any of these actions. It would be disgusting to do such a thing. But there is no way I can see that Nintendo could block this functionality without first properly blocking BootMii.