Your Next Computer Should Be a Desktop
wsj.com
wsj.com
I'm sure that's possible for most systems now if you jump through the hoops, but I haven't had a strong motivation since it has gotten cheaper and cheaper to keep stuffing upgraded components into my ten year-old Coolermaster case.
For most people, I think it will continue to move in the direction of laptops + possibly external monitor for work, phones/tablets for play.
But beyond that, the main issue is how you can better integrate the desktop with the notebook without synchronizing files in both places all the time.
A desktop does get you more bang for your buck, but it also doesn't travel with you, and it takes more effort to synchronize your environment across two machines. I use one laptop for work and hobbies; I'd be annoyed if I had to set up a sync mechanism for both machines.
Beyond that: never never never never deploy on a Friday. Even if it's a copy change, just don't do it as a matter of policy.