Comment 4 for bug 868423

Hmm, there were also proposals of gnome-shell style "dynamic workspaces" or better yet, something like firefox's panorama for ubuntu (mockup):
http://www.techdrivein.com/2011/03/how-about-firefox-4s-panorama-like.html

or KDE4's Activities, which are a lot more useful than just workspaces.

So useful in fact that they have even become a main feature of their new plasma active UI:
http://www.kde.org/announcements/plasma-active-one/

Activities are actually pretty similar to user sessions, but with better management and use of resources...

Anyway, if an user feels he only uses 1 workspace then the option to remove it would be welcome. But as by default am not that sure yet.