One issue I felt that may happen with a built in WM+ is that if they retain the same shape as the Wii Remote, the sensor would be in a different position to people with the add on and that may interfere with the tracking ability i.e. it'd be programmed to know that the sensor is further down and it could throw it a bit off.
I don't think we'll see an intergration but we may see a drop in the price of the Wii Remote itself so the added cost of a WM+ isn't as much as it would be otherwise.







