Somehow I don't understand why so many people are "excited' about this. In current state it's not much useful for end user who can be actually just blogger and blogger really don't need this, as he blogging and manage one-two sites.
Some solutions as "manager tool" for a bunch of websites already exist and Calypso does not have enough features to reach that point.
If developers with enough resources want to build something like this, surely this can help them, anyway if they really want, they can do own solution independently from this.
So I am really interesting why so much excitement?
Nothing wrong about developers, but simple we can check what all developers offer now in market - what kind of plugins and themes, then we can get some view if those developers can build something more powerful based on Calypso if majority of them even "fight" with small plugin or with less/more messed up theme.

Btw. Welcome back Sarah, good to see you here again, Jeff did almost nothing while you were not here, just today he showed up little bit :)