Pretty sure that presence on the wii would help, not hurt, the community. The wii's controls look like they will be much harder to use than the pc's, so I doubt many people will drop the pc for the wii version. On the other hand, those who've never heard of tb will be exposed to it. Out of those people, some might be curious if there are any other versions and stumble upon the pc version.
I kinda hope we don't get too many 5 year olds and 80 yr olds, although it could make for some interesting discussion topics.