I guess the it might be a similar story across Europe.
Sony actually released Eyetoy Sports this Christmas, sort of like a direct challenge to Wii sports. Eyetoy Play 3 already had a number of sports games like Bowling and Volleyball, which I assume are as entertaining as the Wii equivalents.
I think Sony already have a strong grip on the casual party crowd with Eyetoy, Singstar, Buzz and Dancemat games.
Despite the Wii's early sellout, in the UK it still has a long way to go before it represents any serious threat to the role the PS2 has for the casual crowd.
There is no reason why Sony couldn't release a version of the Sixaxis for the PS2.
I thought they were going to link up the Sixaxis with the Eyetoy HD and use the LEDs on the back of the sixaxis to allow the Eyetoy to place the sixaxis in 3D space. There was a thread about this.
Edge had a report on the Gametek guys who have developed a microwave based motion sensing tech, this would be available for PC, PS2/3 and Xbox360. If motion sensing has commercial legs, I don't see why everybody won't get in on the act. This is Wii's achilles heel, it's won't be unique in the market for very long, if it is a success.