If implemented I think this would need to be an optional setting; maybe this would work for some customers, but currently we have our users fixed on a version of the client older than the server due to known issues, and our client installation process requires some instructions on how to locate specific ClearCase files that need to be included in the install.
Possibly you would want to be able to specify in the server settings the latest client version that you want your users to have (not necessarily the server version), and if the client isn't running that version, it could notify the user that a newer version is available with a link either to the install or upgrade instructions. I do know that there is a minimum client version setting on the server but I haven't experimented with it.