This will be possible with FriendUP - a new cloud OS. Essentially, FriendUP is software that gives you a JavaScript based desktop environment that connects to the cloud. By integrating with Golem, it will give you exactly what you're talking about; A decentralized OS that leverages cloud resources to amplify your computer. The only requirements on the local machine would be the ability to run a hardware accelerated web view. In essence, a secure, decentralized thin client technology that runs as your desktop environment.
Check it out here: https://friendup.cloud
I wonder if there is any tie in to Friend: https://friendup.cloud/
David Pleasance is a common denominator between the two:
https://friendup.cloud/employees/david-pleasance/
? Speculation to be sure though.