Am I the only one worried that Sony could do a huge mistake with the Arc ?

[OdyRex]

I think they will have a 'Sony nunchuck', but since it will be wireless (and it requires a camera not a motion sensor), I don't think Nintendo can yell copyright infringement.
Also, I see the DS3 as a cheap ass gamers way of not having to buy a 'Sony nunchuck' when you already have controllers sitting around. Its options depending on what you are more comfortable with.