I see no incentive for them to port the games. First off, the wand will not take off at nearly the rate that the wiimote did. The wiimote came with the system and was the dedicated controller. For PS3, the wand is a peripheral that needs it + eyetoy. This already makes it more restrictive. Second, the ps3 and MS motion sensing is completely different. You cannot have the same types of game controls with both models. So, what does this mean?
This means the small userbase of each HD system cannot be lumped together. It will make no sense to port because the actual number of prospective buyers will be far smaller than the install base. lastly, neither company will have a killer app or the ability to innovate one to move the wands. Even if something like KZ2 for Sony has it bundled, it will be far far smaller than the impact WSR and M+ has.
Next gen who knows, but for this gen its not going to do anything.
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