Wii firmware update will turn it into a worthless piece of plastic.
I was about to say "Smash Bros, here I come!" but then I read this.
Oh well.
Unless you're already using online regularly, you could always turn off your router. Hopefully Nintendo will turn the other cheek on this one... at least for a while. If I lived in Europe or Australia, (or knew Japanese), I'd be all over this, regardless of the potential Wii updates.