How do you figure ? Windows has been running your existing software on iPad-like hardware for close to a decade and has nowhere been a contender yet.
There was no existing booming market at that time though, and hardware was barely capable of running the OS, much less any sizable applications. The options were a barely-portable convertible, or, for something actually usable like a tablet, you had to go with a severely underpowered slate like a Motion. ...which, we loved anyway, once maxed out with RAM (at 2GB & a light centrino chip), an extra battery for 2.5 hours of charge time. ...and once configured properly, since Tablet XP's stock configuration from windows was to present the user with a nearly unusable pen & input panel behavior... but MS has famously been ridiculed enough for making a disastrous mess out of Tablet PCs.
Now thanks predominately to iPhone & iPad, people don't mind an on-screen keyboard, so long as they don't have to tap each letter with a stylus or have it recog characters one at a time and drag you through the tedious validation process... I mean, that was absurdly bad. ...but again, MS has famously been ridi...
Now, there's a booming market full of tablets, and the only two that are selling are the two that do two very distinct things well. The iPad, which does everything one way, a way people are familiar with thx to the iPhone, and to a lesser extent, the Kindles, the reader/poor mans iPad. So you've got a high end leader and a low end leader. Android stumbled out of the gate without anything to set them apart or specialize at, or any amazing hardware. Just a phone OS adapted for a bigger screen, but without any real claim to fame or decent app selection to give people a reason to buy in.
With a market full of iPad customers, many of whom are irritated by the closed nature of iOS file system & sandboxing hurdles among other annoyances, there are plenty of people that'd love the usability of modern iPad-like hardware, but with the ability to simply and seamlessly extend their work environment to a mobile device and go, no matter what program, without syncing files or keeping your work hosted online somewhere in some other file structure, or wondering if there's a compatible application out yet for the new windows mobile version, and if you have to buy it twice or blah blah blah. Just do it seamlessly. But they can't.
Instead, they're going to try to out-android android being the new guy on the block with his hand out.
Ridiculous.
Many people will buy win8 tablets, I don't doubt. It'll be fun to ask them a year later what they use them for.