sixaxis is standard with al PS3s, but how many devs are really making the most of it, let alone adding any useful measure of motion support to games?
A tagged on motion-control scheme to existing games isn't going to sell XB360s to casuals any more than Halo 3 on Wiimote would sell Wii's to Wii's current market. Now *if* MS could map existing games onto motion control, so you could buy the peripheral and have existing games use it, they might get somewhere, at least in selling a peripheral to existing XB360 owners. But the absence of nunchuck type second control input puts a damper on that idea.
The sixaxis is limited in nature. There practically nothing you could do with that can't be naturally incorporated in the traditional control scheme that the controller was designed for. If motorcycle racing was a big genre, the motion control on the sixaxis would be a godsend as you can't closely mimic turning on a motorcyle with a traditional control scheme as you could with the sixaxis (you lean and steer in opposite directions on a real motorcycle while going around curves).
Another thing is that sixaxis is based on a two handed controller design, which is limiting factor in terms of motion control. The reason Nintendo design the nunchuck style controller was to add flexibility that the standard controller designs lacked. If all MS does is release is a sixaxis style 360 controller it will be as underutilized as the sixaxis is now.
Now if MS released a one handed motion control device, it would prove to be more practical and engaging than a sixaxis like controller in games like baseball, tennis, bowling and golf. Obviously a one handed controller couldn't be a total replacement for the current design but it wouldn't have to be as the traditional control scheme has many advantage when its comes to more traditional games.
The nunchuck allows Nintendo to completely replace its traditional controller but
MS can simply offer its traditional controller with a seperate motion control one handed peripheral that offers similar when it comes to games like Wii Sports. Furthermore, the Wii nunchuck has its disadvantages that would show up more readily if Nintendo had a more traditional library like the 360 or PS3. I would hate to have to use a Wii controller for Tekken/VF. The reason why Wii games are so easy to learn isn't because of motion control its because if you were to map the controls to a traditional controller for alot of Wii games you could get by with the original controller of NES system. The more complicated you control scheme become the more impractical the Wii's motion controller becomes.
Which is a big *if*. Look at how MS have competed with EyeToy... They haven't
They've made nothing of the camera peripheral, and aren't showcasing motion controls through that in stores. It doesn't take a Wiimote to compete with Wii - the right hardware (which is out) with the right software (which is missing) would work. Neither company has rolled out real competitors with their existing options, despite plenty of time to knock up a Wii minigames motion-control library.
The difference between mimicking EyeToy versus mimicking the Wii's motion contol is the same difference as mimicking Halo 3 versus mimicking Viva Pinata.
Its my expressed opinion that market perception on Wii's motion control isn't based on a strong library but rather strong marketing by Nintendo. In my area none of the big retail chains have kiosks that allow you to actually play the Wii. For a long time this was also true for the GameStops I regularly visited. Most of kiosks consisted of TVs playing video of people playing the Wii spliced with gameplay footage. This is true for Wii commericals also, where you likely to see more footage of people playing the Wii than the actual games themselves.
I remember my first hands on experience with the Wii at a kiosk which had SuperMario Galaxy and other non-memorable demos and being utterly disappointed because simply flicking ones wrist upward to jump is in no way more fun then simply pressing the jump button on a traditional controller. My 1.5 hour enjoyment with SuperMario Galaxy had nothing to do with the motion control but rather it was a fun game regardless of method of input for controls. There literally only a handful of high profile titles that make full use of motion control. Most of the best selling games consist of franchises that would have sold well on a traditional Nintendo platform, motion control isn't the primary reason of purchase.
I agree that MS and Sony can compete with Nintendo, but it'd need a major, major push. Both have put their eggs in different baskets and any movements in that direction are an afterthought, closing the door after the horses have bolted in the vague hopes a few horses remain.
I don't think MS and Sony can simply release new motion controllers and eliminate all the demand for the Wii and its motion control. But the Wii isn't the Ipod with its almost monopolistic like marketshare and eliminating the uniqueness of the Wii motion control by offering close alternatives can be a step in making sure Wii doesn't end up owning 70% of the console market.