[development] Some of core to contrib?

[Chris Johnson]

Conceptually, I view Drupal as shown in this illustration:
http://i43.tinypic.com/2zqfll1.jpg

Core is really 3 things -- the lowest level subsystems and
abstractions providing APIs, the required glue and UI modules wrapped
around them, and the current CMS-oriented modules included with core.

It would be nice, in my view, to minimize the amount of "required"
code to build a site with Drupal.  The more there are specific use
case modules which are tightly coupled in core, the more it gets in
the way of developing flexible sites and supporting flexible APIs.

..chris