As many have said, the Wiimote was successful because it came with every system from launch. Nintendo could have released the Wiimote as an add-on for the Gamecube, and it would have failed miserably.
The only way PS3/360 can compete with the Wii in the casual space is to launch a motion controller, like with Wiimote, as the standard controller with their next system. I doubt either one will be willing to risk losing the hardcore with a Wiimote, or pack two controllers (Wiimote-like and standard controller) in all of their systems.
The Freedom will be largely forgotten, with very little support from 3rd party developers.







