Why do modern OSes still have an easily accessible command line?  Don't get me wrong -- I love the command line.  I think the argument quickly reduces to, "How in the world would you remove it?"

Let's say this new Windows 8 UI ("!Metro") takes hold and the Desktop does, in a few years, go largely away.  What do we do with apps like Process Explorer, something that's got a GUI and is used by programmers do accomplish low-level tasks, um, sorta like they do on the command-line now?

Can we really ever justify completely trashing the conventional desktop?