I'm working with Doctrine in Joomla and want to make it more generally available. Did a presentation about it at J and Beyond. See
http://jooctrine.org/ But it is not on a official Joomla roadmap (yet). In your question you ask about if "the team" is planning something.... but there is no core team; in fact we all together are the team, so if you, just like me, would like to see more use of Doctrine ORM in Joomla, then please let's get in touch (
her...@yepr.nl) and join forces. Looking forward to your contributions.
Another part of your question is about the use of namespaces and autoloading. That part is being worked on: the Framework, at the moment separated from the CMS, is now (being) reworked to use namespaces in smaller packages that are available via Composer. Look at the other mailing lists, especially
https://groups.google.com/forum/?fromgroups#!forum/joomla-dev-framework