Xbox will copy most of play stations ideas and use them with their ideas to make a better console and probably will get more buyers than playstation.
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Odds are, the next gen XBox is already in development. Additionally, the process is most likely already to a point where any major changes would not be beneficial to the completed product or time frame in which they wish to release it.
As well, I am sure neither company is 100% ignorant as to the design and make up or their competitor's product. At some point each Company has made their decisions on processing sources, hard drives, mother boards and every thing else. That is what makes competitions work. NOT copying the competitor and taking a chance on your own ideas.
We shall see where the chips fall. I for one, am just fine with staying on the PlayStation Wagon. I really like it here, and Microsoft will get Dime 0 from me.