We already know that Microsoft and Apple have always been at odds in certain aspects when in others they have gone hand in hand due to market demands. However that of hardware sales It is one in which the war is increasingly raging seeing the push that Mac sales are having in recent years.
That is why Microsoft has now published an advertisement for television in which the Mac is criticized for not yet having any model or equipment with a touch screen when they have a wide range with different configurations from different manufacturers.
http://www.youtube.com/watch?v=g3Pm_hecE1o
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Personally, I like that devices evolve according to the needs of the market but on the other hand, Tim Cook already made it very clear in the last Keynote, in which he referred to the confusion that his competitors were going through creating 'hybrid' tablets without knowing well where to position, in this case the following image is worth a thousand words.
I believe that it is not necessary to have a touch screen in the way that if you is a trackpad built into a 'complete' portable computer or the mouse on a desktop, rather I consider it an extra rather than a necessity as Microsoft tries to reflect in its advertisement.
Still it is a feature that could be implemented in the near future but always as a system support and not creating the system around the touch screen, where using the mouse in the 4 corners of the screen, is an ordeal.
More information - Apple Panties a MacBook with Integrated Touch Controls