Since most school systems have deepening budget restraints an open virtual classroom will be the most logical solution. However, there is limited technical support for open virtual classrooms. Most teachers have used Blackboard when taking college courses. After one learns how to properly access, post, chat, etc in the open classroom teaching objectives can be met. Today, we have so many how to videos on youtube, one can learn how to work on just about anything.
I posted a flowchart for decision making on commercial vs open classrooms at:http://morrismath.edu.glogster.com/open-source-vs-commercial/