Come on, we're talking about Microsoft here - there will be a few versions available for the OS.
Personally, I like the direction they're going with Windows 8.
I would love a touchscreen in every room of the house - listening to music, browse the web, or just watch a video. It shouldn't matter what type of appliance you're using - the interface should be familiar across all of them.
I think that's the direction even Apple will eventually take. You can already see hints of this with their OS X Lion update.
I have an HP Touchsmart all-in-one that I use on a daily basis (for business and entertainment). I go back and fourth with touch, keyboard, and mouse. I love it!
We are moving to a point where you will be able to run your desktop software on any appliance (ie. tablet).
All computers (appliances) in the near future will have touch capabilities. Creating an interface that will work on anything is a smart move.