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Future releases of ROS will try to move away from the concept of a ROS_ROOT to be FHS compliant, meaning users will be able to install ROS like other other software into e.g. /usr/local/. So there will not be any ROS_ROOT anymore in the future. To be future-proof, do not assume that a ROS_ROOT exists, even in concept.
You can see these REPs for this:
http://www.ros.org/reps/rep-0122.html
http://www.ros.org/reps/rep-0123.html