Netflix app, requires the Operating system to be closed source, with limited access, so you can forget any official support for Netflix on a XBMC based solution where encryption algorythms would be floating all over the net, due to its opensource plan.
Same goes for most DRM based media, it requires the DRM licence to belong to someone specific, not the whole world of developers.
Problem with it as i see it, is that you can add plugins to rip the media being played, which will mean you can make a raw copy of the decrypted media being played and get around the DRM protection, Netflix do not like that.