Looking further out, on a decent LAN who needs a WesternDuckitall drive? Why not store the documents, email, etc on servers and just let the user go apeshit, knowing they can go apeshit.
The Apple iMac 24 is exactly where it needs to be: a great desktop computer and further along a great terminal where IT take care of everything! Your apps, you screensaver, what you are not allowed to **** at. Bad/good it's what we make them do.