However... PC's need productivity. The current way Windows 7 works provides that just fine. It is easy to find and launch programs. You can open up many programs at once and instantly jump from one to another.
You can see everything you are working on. Its nice.
Metro doesn't appear to allow this. I really don't see why you would use Metro in a desktop environment. Enterprise won't pick it up. They won't want to retrain their workforce to use something completely new.
There is no reason to buy Windows 8 if you are happy with Windows 7. Windows 7 was an upgrade for Vista. Vista was an upgrade for XP. Windows 8 is a completely new OS. Its a different product.
Packaging Metro with Windows 8 desktop editions is fine. However the classic desktop view should be the default. You can then switch to Metro if you want and sync that up between devices or whatever. I get the unified interface across devices. I just don't get why Microsoft thought it was a good idea.