LOL, this is too funny. You want to know why they haven't done it for the previous generation MacBook Pro's? Well why didn't Apple issue inertial scrolling the second the new MacBook Pro's got released as well? Because they weren't capable of doing it? Nope.
You are grasping at straws buddy. You have provided no evidence that the MacBook Pro's are even using a single bit of Optimus while I have provided information that they aren't. You don't need an Optimus chip to detect when OpenGL, Core Graphics, Quartz Composer or others are in use. It's all done in software as the article stated which I highly doubt you read or you wouldn't have responded.
"Apple credits its solution to the company's attention to detail when it comes to user interaction (though its original solution with its login/logout missed this mark), and because Apple is unique among PC vendors
in that it controls both the hardware and software. That level of integration is much more difficult when multiple vendors control different parts of the system."
Here's another article for you to read, since the other one wasn't convincing enough for you apparently:
http://www.appleinsider.com/article...book_pro_graphics_switching_isnt_optimus.html