I see a lot of people here bashing Sony for not coming up with anything original. While I agree that the Move is a blatant ripoff, I personally think its decent product. I have enjoyed the few sports games I have played on the Wii and I will enjoy them all-the-more in high definition on my PS3. I don't actually own a Wii. The Move will enable me to enjoy a those few games i felt really benefited from motion controls without having to buy a Wii. I for one intend to buy a Move, at least one golf / tennis / baseball game to enjoy with friends, and at least one good shooter. So as far as market goes, Move is for people like me who have no interest in investing in another game system. It will likely remain a niche product but I think it will still be a success.
Microsoft's Natal may be an interesting and original concept but it realistically has little or no more practical use than Sony / Nintendo's motion control. Can you really see yourself sitting there playing a side scroller / RPG by waving your arms around? Not likely, those games will stick to the standard game pad. First person shooters need precision and I have yet to see for myself that Microsoft's solution can provide that precision. That pretty much leaves the same sports games people are already used to playing on the Wii. The only area I can see Microsoft's solution doing better is fighting games if they manage to implement it correctly.
Can't wait to see the reports of kids breaking household furnishings and accidentally hurting themselves as they try to kick / punch at their opponents.