More and more news is slipping out about Windows Threshold (aka Windows 9). Not only is it rumored that Microsoft is planning to add Ubuntu-style virtual desktops but now WinBeta received word that the new operating system may drop or significantly change the way the Charms Bar functions for desktop users.
Another idea Microsoft have been toying with is removing the Charms completely. While it's possible, we're not entirely sure how that would work. A number of Modern UI apps depend on the Charms for certain features, apps require the Settings button within the Charms to access app settings, and some apps require the Search charm to search within the apps. Microsoft could just tell developers to update their apps, but that seem unlikely.
Either way, if Microsoft stick to their plans, the Charms bar won't exist for desktop users like it does today. Of course, Threshold is currently in Alpha, meaning it's very early days and plans can easily change. Microsoft may decide to leave the Charms bar the way it is in the end, however that seems very unlikely as the current implementation of it in Windows 8.1 is rather poor and insufficient.