Re: This is why there was no Win7 SP2
"The only thing it doesn't support is touch, which as predicted turned out to be something few people care about in a laptop and no one cares about in a desktop."
And with cloud being so prevalent now for application development you can build touch into the cloud interface for access from a touch enabled device anyway
http://ie.microsoft.com/testdrive/graphics/toucheffects/
Above is an example of such released by Microsoft. so you don't need the operating system to drive the touch component, it can be driven by the site.