That's kind of the issue, right? There's no way a big enterprise is going to be using 8 the day after launch. I suspect most will be hostile to it. MS's best bet is to get 8 into the hands of as many users as possible, so they'll push work to upgrade.
agreed, they definitely seem to be targeting the more "casual" audience. But who knows, if the whole "shared kernel" thing has some practical benefits for businesses, we might see more widespread adoption.