For a long time enthusiasts of the open source development methodology have predicted that the traditional method will sink in the sand sooner or later. And since, as far as we can tell, Microsoft still employs such methods, the expectation is that one day its operating system upgrade would be a downgrade.
It's hard to tell from all the noise in the comments, but preliminary results seem to suggest Vista is that downgrade:
Extensive testing by the exo.performance.network (www.xpnet.com) research staff shows that SP1 provides no measurable relief to users saddled with sub-par performance under Vista.
And here's some corroboration that people are beginning to realise that the Microsoft train has hit the Brooksian wall:
Ninety percent of 961 IT professionals surveyed said they have concerns about migrating to Vista and more than half said they have no plans to deploy Vista.