Hybrid OS is EXACTLY the kind of forward thinking that people always complained that Microsoft lacked.
This is very, very wrong.
It's much easier to see in the shift in the enterprise because it's been a very dramatic shift to the cloud.
On the consumer side, the shift is less perceptible because cloud has already become pervasive, but on the enterprise side, companies are just starting the revolution to more cloud based software delivered through the browser instead of through dedicated desktop applications.
You see it in the infrastructure as well. All of the companies I work with now -- the biggest pharmas in the world -- all host their enterprise environments "in the cloud" on virtual machines.
This is the trend, but it's not as obvious to the fish that the fish is surrounded by water (in other words, it's not as obvious in the consumer market because it's the way it's always been -- Hotmail, Gmail, Facebook, etc).
But you see it in Microsoft's push for Office Web Apps, Office 365, hosted SharePoint, Windows Azure Service Bus (hosted BizTalk-lite), Windows Azure AppFabric, etc. There is a shift in the Enterprise that is catching up to the consumer market and that shift de-emphasizes the client runtime environment by delivering software via the browser instead of installed applications.
The future of Microsoft will be in cloud based software and cloud based services and it's what Microsoft wants as well because it means subscription based Office -- and software in general -- being the norm and this is a huge win for Microsoft.
You can call Microsoft's hybrid design a "forward" decision, but it's a terrible forward decision for all of the compromises it forces their development teams and product managers to make not to mention their hardware partners who have to build tablet sized hardware for the more power hungry desktop/laptop OS architecture.
The desktop model will be going away, but it should not be the dead weight dragging their mobile and tablet platform. Their mobile and tablet platform should have been one -- and I speculate that it will be, moving forward -- with the desktop and servers continue to serve content creators.