I believe that the Wii's online system works through Nintendo's own host servers rather than having a sole Wii getting all the weight dumped on it. A good example to think of is Super Mario Strikers. When you go in to do an online tournament match there is no "host" you just go and request a game and the only REAL thing that affects the lag is your own connection to the other person. But, even then you're given their connection strength BEFORE the match so you can turn them down and not face them.
In any case, my point is that a person "hosting" has a lot less power than you think. It seems like most of the participants will be in North America anyway so the only thing that matters is your OWN internet connection and speed.
In any case, my point is that a person "hosting" has a lot less power than you think. It seems like most of the participants will be in North America anyway so the only thing that matters is your OWN internet connection and speed.