At least with desktop software (even the most closed) you have your data in your hands, with the cloud that isn't possible. You can't "export" your Facebook social network to disk.
A lot of businesses are now using Google Apps, and MSFT has released 365, and they're going that way too.
Even with the Sony data hijacking I still use PSN as are most people.
We're not going back to the way things were 10-20 years ago. Microsoft is late to this game with Windows 8.
What's being whined about here is inevitable. Cloud music storage and pretty much any cloud service is portable, and people just use too many computing devices today compared to 20 years ago.
I was in Belgium controlling the Amazon Cloud network with a RSA key pair for security for example.
It would be nice if Sony had RSA authentication on Playstation the way AWS does for sFTP login, but even without that, the point is we have to be able to do anything from anywhere on any device securely.
The operating system has to be a thin client going ahead into the future. Just like Sun micro-systems had envisioned with the Sun One devices 15 years ago.
The way Sun tried to do it with a proprietary VNC and that was clearly wrong, and for that they paid. I mean they basically went out of business and sold their assets.
All those online music editors(virtual online Protools AJAX apps) and video editors(virtual TV video mixing studios) that failed 2 years ago will suddenly be possible in 4-5 years with better internet and native code running in browsers like Chrome.
People don't want to work alone on a machine using software, they want to collaborate in real time on the network. For some types of media, such as music editing, video editing, ect.... that's been a hard thing to do.
Windows as it is now is really bad at letting people share and collaborate. I don't see that improving much with Windows 8, but they're copying Google, and that's where Google's headed at least. So eventually Microsoft will get there too through these incremental changes.