What is needed is not an OS, it's an organiser. A place I store files, write letters, etc. Not some multiple window thingy, but some simply thing that gives me quick access to my applications.
Everyone trying to recreate Mac OS or Windows, but webbased is doomed to failure. Mac OS and Windows are used because people don't have a choice as to what desktop paradigm they can use. If one decides to switch, there are no applications, so you are forced into using a particular way.
But it has always been a flawed design, so don't copy this stuff.