"Resistance is futile" intoned Star Trek's Borg as they absorbed everything and everyone into their hive mind collective. That's true for the web, and one of the largest developer platforms in the world has suddenly become part of its growing collective.
Of course, thinking more about WinRT and its implicit process isolation and controlled communication channels, there's a parallel with trends in silicon architectures and the move to massive parallelization using NUMA along with lower power architectures, with inter-CPU communications channeled via Transputer-like direct memory access – architectures that seem ideal for WinRT, which more than ever seems a software architecture for the long time, and intended to replace the venerable Win32. And that throughput computing model is one that works as well for servers as for clients, especially cloud servers with millions of users…
If it wasn’t for the old Windows desktop for those legacy Win32 applications there'd be people comparing it to Google's ChromeOS. It’s WinRT that really makes the difference, giving Windows 8 applications access to the OS and to device hardware, something that ChromeOS goes a long way to preventing. Perhaps then it's closer to RIM's BlackBerry PlayBook and the Flex APIs that expose QNX to Flash developers and AIR.
Of course all those analogies only describe aspects of Windows 8 – which is, despite its roots in the web very much its own thing. And that's just the way things should be.