I just read the full TSB report:
Aviation Investigation Report A13P0127 - Transportation Safety Board of Canada
It is interesting that the TSB specifically faulted reliance on "see-and-avoid" (or "see-and-be-seen"), noting its inadequacy:
"The failure of the see-and-avoid principle to avert this collision illustrates the residual risk associated with reliance on that principle as the sole means of collision avoidance. If the see-and-avoid principle is relied upon as the sole means of collision avoidance when operating in visual flight rules conditions, then there is a continued risk of collision."
Of course we've known that "see-and-avoid" is not adequate for nearly 60 years, ever since the 1956
Grand Canyon mid-air collision, and the 1958
United 736 mid-air collision.
Those two crashes directly led to the passing of the Federal Aviation Act of 1958, which established the FAA and a revamped the US ATC system.
Here we are in 2014 and "see-and-avoid" is often still the sole mean of preventing collisions especially among GA pilots.