Technically, MS is duplicating Apples model. Full OS (Win8) for the desktop/laptop market, scaled-down OS for tablets. And then there's Windows Phone (or Mobile, or whatever they call it now) but that's such a laughably small part of the phone OS market as to be totally irrelevant. Otherwise, even the App Store concept is the same, right down to the curated behaviors. Consumers adapted just fine to this model on Apple and likely will again with MS as well, although jury is still out whether or not it will be as successful and peer pressure (even when passive) does play a role in adoption of any given technology standard.
Whats important here is recognition that MANY iPad/iPhone users are already Windows users. Theyve already made the choice to live in a mixed ecosystem and it works just fine. Apps like Dropbox and cross-platform iTunes makes this possible. Given time, the same can be true for the Surface.
The big mistake, I think, is that they have WinRT for tablets and then something different for phones. That makes little sense to me given that both the Surface and a matching phone are native "peers" if you look at how people use their smartphones and tablets in the iOS and Android world today. Not treating them as peer devices for app support is the big miss here in my mind. But I suspect this has more to do with MS and their long and incestuous relationship with hardware makers. They only make money when they license software. Nonetheless, I think Microsoft's strategy is deeply flawed. They are treating the Surface as a scaled down laptop, whereas Apple treated the iPad like a scaled up iPhone. Its this "tablet as consumption device" model that Microsoft is missing, and instead are creating an overly-complex sales proposition. I think users are going to compare the Surface and Windows RT to iPad/iOS and the differences there will be significant from a usability perspective.
Regardless of the above, however, I think The Verge article is wrong. It's not that big of a problem for MS. Their market for Surface won't even think about the OS on there. They will just look at the pre-loaded apps (Email, browser, Office) and the App Store and make the comparison to the iPad. That's all.
I do now, however, understand why Office for iOS has been so long in coming.