Comment 73 for bug 60448

Someone already did, and it is called journald: http://0pointer.net/blog/projects/journalctl.html
Recent versions of gdm, kdm and dbus already use the journald by default to replace .xsession-errors, and thus avoid all these problems. I guess we only have to wait for Ubuntu to catch up to Fedora and OpenSuse. (I don't know about CentOS, but it unavoidable that journald will be the default there eventually)