Whilst, I've no problem with your conclusion, I don't think the reasoning is illustrated well.
You're talking about touch on the desktop and m/k use in metro - the opposite of what's intended.
control panel is easy enough - power users will find out Win+X or right-click on start tip. The rest can do a search for it - typing no more than the letter 'C'.
"Stretching compatibility" - all applications developed for Win7 run fine in Win8 - that's NOT compatible?
Tablets need a clear business justification to not choose iPad? What does the iPad have that these won't? Even Windows RT will be more manageable than iPads (iPads don't have much beyond EAS policy enforcement). Businesses running a handful of apps don't care about 600,000 apps in an app store. They care that they can begin using their applications right now on an x86 tablet whilst metro-style equivalents are developed, that these same apps can be run from employees tablets and desktops (employee needs to only familiarise with one application that runs on any hardware).
Touch hardware will help too.
Minimal flipping back and forth between metro and desktop is needed.
I've made counter-comments but to be honest I don't want to, I'm not bothered by someone saying they don't like windows 8 but too much of this article is just "blaah, it's yucky I don't like it", rather than points fleshed out properly with examples. Only paragraphs 6 and 7 seem to have anything which could be remotely called an example.